The ISEE Upper Level essay tips you find on most prep sites amount to four words: "it doesn't get scored." That is technically true — ERB assigns no numerical score to it. But if your son is applying to St. Thomas High School, his essay lands on the Admissions Committee's desk alongside every other part of his ISEE report, and they read it. I've seen students spend 60 hours preparing for the multiple-choice sections and zero minutes on the 30-minute writing sample. That gap is costly. At St. Thomas, the ISEE essay is the only unfiltered, timed piece of writing in the entire application file — and the Admissions Committee knows no one helped edit it.
St. Thomas High School ISEE Quick Facts
- Test required: Upper Level ISEE (no substitutes — HSPT and PSAT not accepted)
- School code: #571055
- On-site test dates (2026–27 cycle): November 14 and January 9 (Saturdays)
- Application fee deadline: January 15 | Supporting documents due: January 31
- Admission decisions: Late February–March | Scholarship notifications: Mid-March
- Scored sections: Verbal Reasoning (40 questions, 20 min), Quantitative Reasoning (37 questions, 35 min), Reading Comprehension (36 questions, 35 min), Mathematics Achievement (47 questions, 40 min)
- Scaled score range per section: 760–940 | Stanine range: 1–9
- Essay: Unscored by ERB, 30 minutes, forwarded directly to St. Thomas Admissions Committee
- No calculator permitted. No guessing penalty. Four answer choices per question.
- Total seated time: Approximately 3 hours total (includes administrative time and breaks)
- Format options: Paper at St. Thomas, Prometric center, or remote proctored home testing
Why the ISEE Unscored Essay Importance Is Real at St. Thomas High School
Every other piece of your son's application has been shaped by someone else. His teachers wrote the recommendations. You helped compile the résumé. His personal essay went through multiple drafts. The ISEE essay was written alone, under time pressure, with no feedback. For a school guided by the Basilian Fathers' mission — developing the whole person in goodness, discipline, and knowledge — that raw, unpolished writing sample tells a story no other document can.
ERB does not assign a stanine or scaled score to the essay. But "unscored by ERB" does not mean "ignored by schools." St. Thomas's Admissions Committee uses it as a character and communication check. They want to know: Can this student organize a thought? Does he take a clear position? Does he write with any conviction? A scattered, unpracticed essay next to a focused, confident response from another applicant is a meaningful differentiator — in the wrong direction.
The prompt gives your son 30 minutes and two lined pages. That is not much space to impress anyone. It is, however, enough space to make a clear, confident argument — if he has practiced doing exactly that before test day.
What ISEE Stanine Score Does St. Thomas High School Expect?
The ISEE stanine is the primary metric St. Thomas's Admissions Committee references. Each of the four scored sections produces a stanine between 1 and 9. Stanines 7–9 place your son in the top 25% of same-grade test-takers nationally. Stanines 4–6 are average (middle 50%). Stanines 1–3 fall in the bottom 25% and create real headwinds in a competitive applicant pool.
St. Thomas has not published a minimum stanine cutoff, and the school explicitly uses holistic review. That said, families in the Houston Catholic school community consistently report that stanines of 7 or higher — particularly in Quantitative Reasoning and Mathematics Achievement — are where merit scholarship consideration becomes realistic. A stanine of 5 or 6 with an otherwise strong application is competitive for admission but unlikely to generate scholarship money.
The scaled score range per section is 760–940. A scaled score in the 890–940 range typically corresponds to a stanine of 7–9, though the exact conversion shifts depending on the norming group for that test cycle. Target a stanine of 7 or above in every section. Treat stanines of 8–9 in the math sections as your scholarship benchmark.
- May–June (rising 8th grade): Take a full-length diagnostic ISEE practice test. Identify which stanine sections need the most work.
- July–August: Focus targeted prep on Quantitative Reasoning and Mathematics Achievement. Begin timed essay writing practice — one prompt per week, minimum.
- September–October: Take two more full-length mock tests. Simulate the full seated experience including the essay every time.
- November (on-site date at St. Thomas): Sit the exam. If your stanine comes back below 6 in any section, the January 9 on-site date is still available.
- January 9 (second on-site date): Retake if needed. Application fee due January 15. All documents due January 31.
How Much Do ISEE Scores Matter vs. Grades and Recommendations at St. Thomas?
St. Thomas reviews applications holistically, and the Admissions Committee is clear that the ISEE reflects only one day in a student's life. That framing is genuine. A student with stanines of 5–6 who has straight A's, strong teacher recommendations, and a compelling essay has a real shot. But the ISEE carries two functions nothing else in the file can replace: it produces the stanine that determines scholarship eligibility, and it produces the essay that lands unfiltered on the admissions desk.
Middle school transcripts cover 6th grade, 7th grade, and first-semester 8th grade. Admissions officers want to see an upward or consistently strong grade trend. A dip in 7th grade followed by a strong first-semester 8th grade recovery is a positive signal. Standardized test scores from 6th and 7th grade — MAP, ERBs — provide national context for your son's academic trajectory.
In my experience, the applications that struggle at competitive Catholic schools are not the ones with one weak section. They are the ones where every element is slightly below average at the same time. A stanine of 6, a B+ GPA trend, generic teacher recommendations, and an underdeveloped essay form a pattern. Strengthen the essay and you strengthen the entire file's impression.
Teacher recommendations use the HAIS or Catholic High School forms. Both the Math teacher and English teacher must submit letters. Those recommendations carry real weight — choose teachers who know your son well enough to be specific, not just complimentary.
ISEE Essay How to Prepare: Writing for a Catholic All-Boys School Audience
The ISEE Upper Level essay prompt is open-ended — opinion-based or creative, not passage-based. Your son will not be asked to summarize a reading. He will be asked to take a position or reflect on a value or experience. He has 30 minutes and two lined pages to make his case.
For St. Thomas specifically, the audience is a Basilian Catholic school looking for young men of character, not polished PR copy. An essay about a failure, a lesson learned through difficulty, or a commitment to service will resonate more than a list of achievements dressed up in 30-minute prose. Authenticity is not a soft concept here — it is the point.
The structure that works under timed pressure is straightforward: one sentence taking a clear position, two or three developed supporting points, one concrete example per point, and a closing sentence that restates the position with added depth. That structure can be practiced and internalized before test day. Without practice, most 8th-grade students spend the first 8–10 minutes deciding what to say. That leaves only 20 minutes to write — and the result shows.
I've worked with students who were excellent writers in class and still produced weak ISEE essays because they had never written one argument from scratch in 30 minutes. The skill is not natural writing ability — it is structured writing under pressure. Those are different, and only one of them can be trained before test day. Our Essay Writing Practice Tests are built around exactly that kind of timed, single-prompt practice.
- No clear position in the first sentence. Admissions officers read quickly. Lead with your argument, not with a warm-up.
- Generic examples. "I learned teamwork from playing soccer" tells no story. One specific moment, one decision, one result — that shows real thinking.
- Restating the prompt instead of answering it. The committee can read the prompt. They want your son's response.
- Incomplete essays. Running out of time leaves the reader with an unfinished impression. Practice ending strong every single time.
ISEE Quantitative Reasoning for Houston Private School Applicants: Why Critical Thinking Beats Formula Drills
The ISEE's Quantitative Reasoning section is not a computation test. It uses word problems and quantitative comparisons designed to measure how your son thinks, not what he has memorized. With 37 questions in 35 minutes and no calculator permitted, the section rewards students who can reason quickly across multi-step problems — not students who can execute long division fast.
Most ISEE math prep programs treat Quantitative Reasoning and Mathematics Achievement as the same kind of preparation. They are not. Mathematics Achievement (47 questions, 40 minutes) tests applied calculation across arithmetic, algebra, and geometry. Quantitative Reasoning tests logical deduction, pattern recognition, and comparative analysis. A student who drills formulas will improve his Mathematics Achievement stanine. A student who trains critical thinking will improve his Quantitative Reasoning stanine — and that is the section where students most frequently leave points on the table.
For a St. Thomas applicant whose scholarship eligibility depends on stanine scores, a one-stanine improvement in Quantitative Reasoning is worth the same as any other section — and it is often more achievable with the right preparation. Our STEM Critical Thinking Practice Tests give your son better footing on the section most prep books underserve, with multi-step reasoning and logical deduction problems that mirror the actual test format.
What Supporting Documents Does St. Thomas Require Beyond the ISEE?
The ISEE is one piece of a multi-part application. St. Thomas requires transcripts from 6th, 7th, and first-semester 8th grade; standardized test scores from 6th and 7th grade (MAP, ERBs, or equivalent); Math and English teacher recommendation letters on HAIS or Catholic High School forms; a student personal essay submitted through the admissions portal; a student résumé; and a $75 non-refundable application fee.
The application fee deadline is January 15. All supporting documents must be received by January 31. Admission decisions come in late February to March. Scholarship and financial aid notifications arrive in mid-March — after the admission decision. Applications submitted after January 31 are reviewed on a rolling basis, space permitting, but late applications carry real risk at a school with limited freshman seats.
One detail many families miss: the Admissions Committee interview is not scheduled until every other document is on file. Submitting everything early is not just organizationally smart — it gives your son more lead time to prepare for the interview. First-impression behavior at an all-boys Catholic school interview matters. Practice answering questions with eye contact, complete sentences, and specific examples before he walks in the door.
Frequently Asked Questions: St. Thomas High School ISEE Admissions and Essay Prep
Q: Is the ISEE essay really unscored?
A: ERB does not assign a numerical score to the essay, but every school that receives your ISEE report also receives your essay alongside it. For St. Thomas High School, it is the only unfiltered, timed writing sample in the entire application — no one helped edit it, and the Admissions Committee knows that. That makes it more revealing, not less important.
Q: What kind of prompt does the ISEE Upper Level essay use?
A: ISEE Upper Level essay prompts are open-ended opinion or creative prompts — your son is not summarizing a passage. A typical prompt asks him to take a position or describe a personal value or experience. He has exactly 30 minutes and two lined pages. Because the prompt is broad, students who walk in without a practiced structure often write scattered responses. Timed practice with real opinion prompts before test day is the single most effective preparation strategy.
Q: How do I help my son write a strong ISEE essay for a Catholic all-boys school like St. Thomas?
A: Focus on authenticity, character, and community values rather than listing accomplishments. St. Thomas is guided by the Basilian Fathers' mission of developing the whole person — goodness, discipline, and knowledge. An essay that shows how your son thinks about service, responsibility, or a challenge he overcame will resonate far more than a generic brag. Practice timed essay writing with prompts that require him to take and defend a clear position in under 30 minutes.
Q: Does St. Thomas require the ISEE, or will the HSPT or PSAT be accepted?
A: St. Thomas requires the Upper Level ISEE specifically for all freshman applicants. The HSPT and PSAT are not accepted substitutes. Your son must register through ERB and send scores using St. Thomas's school code #571055. He can test at the on-site dates St. Thomas hosts in November and January, or at any ERB-approved Prometric location during the Fall or Winter testing seasons.
Q: What ISEE stanine score gives my son the best chance of admission to St. Thomas?
A: The ISEE stanine runs from 1 to 9. Stanines 7–9 place a student in the top 25% of same-grade test-takers nationally and represent the range where merit scholarship consideration becomes realistic. Stanines 4–6 are average (middle 50%) and competitive for general admission alongside a strong overall application. Stanines 1–3 (bottom 25%) make admission significantly harder. St. Thomas uses holistic review, but the stanine is the primary ISEE metric the Admissions Committee references.
Q: Will a strong ISEE score qualify my son for a merit scholarship at St. Thomas?
A: Yes. St. Thomas explicitly awards merit scholarships for incoming freshmen based on ISEE performance. No specific published cutoff exists, but families in the Houston Catholic school community consistently report that stanines of 7 or higher — particularly in Quantitative Reasoning and Mathematics Achievement — strengthen a scholarship case considerably. Financial aid and scholarship notifications are sent in mid-March, after the admission decision. That means your son will learn whether he earned a scholarship only after his admission offer arrives.
Q: Can my son take the ISEE at St. Thomas, or does he have to go to a separate test center?
A: St. Thomas hosts the ISEE on-site on two Saturday dates each admissions cycle — one in mid-November and one in early January. For the 2026–27 cycle, those dates are November 14 and January 9. Testing at St. Thomas itself can reduce logistical stress on test day. Your son can also test remotely via proctored home testing, which ERB now supports — a useful option if he performs better in a familiar environment.
Q: What supporting documents are required beyond the ISEE, and when are they due?
A: Beyond the ISEE, St. Thomas requires transcripts from 6th, 7th, and first-semester 8th grade; standardized test scores from 6th and 7th grade; Math and English teacher recommendations on HAIS or Catholic High School forms; a student personal essay; a student résumé; and a $75 non-refundable application fee. The fee is due January 15 and all supporting documents by January 31. One detail many families miss: the Admissions Committee interview is not scheduled until every other document is received — so submitting early directly accelerates your son's interview timeline.
Prepare Your Son for St. Thomas High School's ISEE — Essay and Critical Thinking, Both
The two sections that most determine your son's outcome at St. Thomas are the ones most prep programs underserve: the Quantitative Reasoning section that drives his stanine and scholarship eligibility, and the unscored essay that lands directly on the Admissions Committee's desk.
At stemcriticalthinking.com, our STEM Critical Thinking Practice Tests are built around the multi-step reasoning and logical deduction skills the ISEE Quantitative Reasoning section actually tests — not formula drills. And our Essay Writing Practice Tests simulate the ISEE's exact 30-minute single-prompt format, so your son walks into test day with a practiced structure and a confident voice.
I've seen students raise their stanine score in six weeks of targeted critical thinking practice. That improvement can be the difference between a general admission offer and a merit scholarship at St. Thomas. Both practice test types are available now — start with a diagnostic today and know exactly where to focus before the November test date.
