Private High School Admissions Testing: What Families Need to Know
Applying to private high school brings a layer of testing most families haven't dealt with since elementary school admissions, if ever. Unlike the general private school entrance testing many families are familiar with, high school admissions testing tends to be more standardized, more heavily weighted in the application, and — for students with learning differences — more likely to reveal a mismatch between a student's true ability and how they perform under strict timed conditions.
The Exams Most Bay Area Private High Schools Use
Most competitive private high schools rely on one of a small handful of standardized exams:
ISEE (Independent School Entrance Exam) — the most widely used exam for private high school admissions, offered at Lower, Middle, and Upper levels depending on the grade applying to
SSAT (Secondary School Admission Test) — common at many East Coast-affiliated and some Bay Area independent schools, also offered at multiple levels
HSPT (High School Placement Test) — used more often by Catholic and parochial high schools
Each exam differs in format, scoring, and timing, but all share strict time limits across math, verbal reasoning, reading comprehension, and (for some) an unscored writing sample.
Why These Tests Can Be Harder Than They Look
These exams are designed to differentiate applicants, which means the time pressure is real and intentional. For a student with ADHD, a specific learning disability, or slower processing speed, the exam can significantly understate their actual academic ability — not because the material is beyond them, but because the format doesn't give their brain the runway it needs to show what it knows.
This is often the first time a family sees, in stark terms, how much timed testing can distort a picture of a bright, capable student.
How Accommodations Work for These Exams
Unlike school-based accommodations, testing accommodations for the ISEE, SSAT, and HSPT must be requested directly through each testing organization, and each has its own application, deadlines, and documentation requirements. Common accommodations include:
Extended time (most often time-and-a-half)
Extra breaks
A separate testing location
Use of a computer for written portions, where applicable
Because these requests go through the testing company rather than the school the student currently attends, having documentation from school doesn't automatically transfer — the evaluation data has to independently meet each organization's specific criteria.
What Documentation Is Required
Testing organizations typically want to see a comprehensive, relatively recent evaluation that clearly diagnoses a disability and directly ties it to the specific accommodation being requested. General statements about a student "struggling with tests" aren't enough — the documentation needs to show, with real data, exactly how and why extended time or another accommodation is necessary.
This is where families sometimes discover that documentation used for school (say, a 504 Plan built on older or narrower testing) doesn't fully meet what these outside organizations require for their own separate approval.
Timing Matters More Than Families Expect
Because these accommodation requests are processed independently — often with review windows of several weeks — waiting until close to a test date can mean missing the accommodation entirely, even with a strong, legitimate case. Families applying for high school admission typically need to plan documentation and accommodation requests in the spring or summer before the fall application season, well ahead of test registration deadlines.
Where an Evaluation Fits In
A thorough evaluation gives families two things at once: a clear understanding of what's actually happening for their student, and documentation specific enough to satisfy the ISEE, SSAT, or HSPT's own accommodation requirements — rather than assembling a patchwork of school records that may not hold up to outside review.
If private high school admission is on the horizon and your student's documentation is more than a couple of years old, or was never built with standardized testing accommodations in mind, it's worth having it reviewed well before test registration opens.