How to get into Mary Institute and Saint Louis Country Day School
St. Louis, MO Grades PreK–12 · DaySelective
Mary Institute and Saint Louis Country Day School is a selective day school in St. Louis, MO, serving grades PreK–12. Applicants typically take the ISEE or Early-Childhood (WPPSI/WISC/ERB). Below is the admission test, the application timeline, and how to prepare.
Tuition: varies by grade and program. This figure is approximate and changes every year — always confirm current tuition and financial aid on Mary Institute and Saint Louis Country Day School's official site.
Required admission tests
ISEE — Independent School Entrance Exam
Grades 2–12 (Primary / Lower / Middle / Upper) · Stanine 1–9 (no penalty for wrong answers)
Prep for the ISEE with iPrepGeniusEarly-Childhood (WPPSI/WISC/ERB) — Kindergarten & Lower-School cognitive screening
PreK–Grade 2 entry ('private kindergarten') · Percentile / index scores (administered by a psychologist)
Prep for the Early-Childhood (WPPSI/WISC/ERB) with iPrepGeniusApplication deadlines
These are typical windows that change each year — confirm current dates on Mary Institute and Saint Louis Country Day School's official admissions page.
How to prepare
- Start with a free diagnostic to find your child's strengths and gaps on the ISEE or Early-Childhood (WPPSI/WISC/ERB).
- Practice every section with adaptive, verified questions.
- Take full-length, section-timed simulations to build pacing and stamina.
- Track a readiness percentile and follow a weekly study plan up to the deadline.
Build your Mary prep plan
Diagnostic → adaptive practice → simulations → readiness score. Start free.
Start freeiPrepGenius is an independent study resource, not affiliated with or endorsed by Mary Institute and Saint Louis Country Day School or any test publisher. School details are a starting guide — verify current requirements with the school.