ISEE Scores Explained: What Stanines, Scaled Scores, and Percentiles Mean

When an ISEE score report arrives, it can look like a wall of numbers — scaled scores, stanines, percentile ranks, and comparison bands. Parents applying to competitive independent schools often have the same first question: what does this actually mean? This guide breaks every element down clearly, so you can understand where your child stands and what schools are looking for.

ISEE Scoring Structure: Scaled Scores and Stanines

The ISEE reports two types of scores for each scored section: a scaled score and a stanine. The essay is not scored — it is sent directly to schools as a writing sample.

Scaled scores vary by level. At the Lower Level (applying to grades 5–6), scaled scores range approximately from 760 to 940 per section. At the Upper Level (applying to grades 9–12), they range from about 800 to 940 per section. These numbers are not percentages — they are simply the test's internal scoring scale, adjusted for test difficulty across administrations. A scaled score of 860 on one administration is designed to mean the same thing as 860 on a different administration, even if the questions differed in difficulty.

The stanine is what matters most to schools. It translates your child's performance into a 1–9 band relative to other students who have taken the same level of the ISEE in the prior three years.

How Stanines Work

Stanine stands for "standard nine." Each stanine corresponds to a specific portion of the comparison group:

Stanines 1–3 are generally considered below average, 4–6 are average, and 7–9 are above average. A stanine 9 places a student in the top 4% of ISEE test-takers. A stanine 7 means the student outperformed roughly 77–88% of the comparison group.

One important note: the comparison group is made up of students who have taken the ISEE in the past three years — a self-selected group of motivated private school applicants. This means an "average" ISEE stanine still represents a student performing well above the national average for their grade.

The Essay: Not Scored, But Still Read

The ISEE essay section receives no numerical score from ERB (the test publisher). It does not appear as a stanine or scaled score on the score report. Instead, the handwritten essay is scanned and sent directly to every school that receives the student's scores.

Admissions offices use the essay as a writing sample. Schools want to see how a student communicates under timed conditions — without the assistance of parents, tutors, or editing tools. A well-organized essay with specific examples and a clear argument is genuinely helpful. An off-topic or poorly organized essay can raise concerns. Students should practice timed essay writing as part of their ISEE preparation.

ISEE vs. SSAT: How the Scoring Systems Compare

Many families consider both the ISEE and SSAT. The two tests report scores differently:

• ISEE: Uses stanines (1–9) and scaled scores. No wrong-answer penalty — every question should be attempted.
• SSAT: Uses percentiles (1st–99th) and scaled scores. Has a 1/4-point deduction for wrong answers — guessing strategy matters.

Both systems report performance relative to same-grade test-takers in the prior few years, not against the general student population. A 70th percentile on the SSAT and a stanine 6 on the ISEE both indicate above-grade-level performance compared to the general population — but are roughly middle-of-the-pack within the private school applicant pool.

See our full ISEE vs. SSAT comparison for more detail on which test to choose.

What Competitive Schools Look For

What constitutes a competitive score depends on the school. However, there are general patterns:

• Most selective boarding schools (Exeter, Andover, Choate, Loomis Chaffee): Applicant pools are heavily weighted toward stanines 7–9. A stanine 9 in all sections makes a student academically very competitive. Stanines below 6 in core sections are unusual among admitted students at the most selective schools.
• Competitive independent day schools (NYC, Bay Area, and other major metro areas): Stanines 6–9 are typical among applicants. Many schools' admitted class averages fall in the stanine 7–8 range.
• Less selective independent schools: Stanines 4–6 may be competitive, particularly when the overall application is strong in other areas.

Schools almost never publish their score expectations publicly. The best source of guidance is the admissions office itself — ask what a competitive academic profile looks like for incoming students at the grade level you're applying for.

Reading an ISEE Score Report: Section by Section

A standard ISEE score report includes the following for each scored section:

• Raw score: Number of questions answered correctly (unscored questions are not counted against you).
• Scaled score: The internally adjusted score within the section's scale range.
• Stanine: The 1–9 band, compared to the prior three years of same-level ISEE test-takers.
• Percentile rank: The specific percentile within the stanine band (e.g., 82nd percentile = stanine 7).
• Score bands: A visual band showing the margin of error around the stanine — score bands overlapping between two stanines indicate that a student's true ability likely falls somewhere between them.

The score report also shows which specific skills within each section the student performed well or poorly on — this is useful for targeted prep if retesting.

Grade-Specific Expectations by Level

The ISEE has four main levels for traditional academic-year testing. What's competitive varies by which level your child takes:

Score Improvement Between Testing Seasons

Students may take the ISEE up to three times per year, with a maximum of once per testing season (fall, winter, spring/summer). Score improvement is common, particularly in verbal sections, where vocabulary growth from structured study is measurable.

Important: Schools receive all ISEE scores submitted during the application year — there is no score choice. If a student takes the test twice in fall and once in winter, all three scores go to every school that receives the report. This is different from the SAT, where students can choose which scores to send.

Practically, most admissions officers focus on the highest scores across administrations, but the full record is visible. Students who show meaningful improvement between sittings generally benefit from taking it again — the improvement itself signals effort and growth.

FAQ: ISEE Score Questions