The ERB CTP (Comprehensive Testing Program) is the gold-standard achievement test for independent and private schools — used by Dalton, Exeter, Prep schools, and many top independent schools nationwide. It measures reading, verbal reasoning, quantitative reasoning, and writing mechanics against an independent school norm.
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Test Structure
Each section tests a distinct skill set normed against independent school peers. Understanding the breakdown helps you focus your child's preparation on the areas that matter most.
Assesses reading ability through literary and informational passages at advanced complexity levels. Normed against independent school students — a strong score means your child is competitive among private school peers, a rigorous comparison.
Tests analogical reasoning, vocabulary, and verbal problem-solving. The verbal reasoning section goes beyond vocabulary recall — it requires applying word relationships at higher cognitive levels than most standardized tests.
Measures mathematical thinking and problem-solving beyond computation. Tests number relationships, pattern recognition, and algebraic thinking. Emphasis on reasoning, not arithmetic speed.
Study Strategy
Private school norms are demanding. Consistently reading complex texts builds the comprehension stamina the CTP measures.
The verbal reasoning section heavily tests analogies — function, part-whole, creator-creation, and category types. Daily practice with analogy sets pays off.
CTP quantitative is about logic and number relationships, not arithmetic drills. Puzzle-based math and pattern games are better prep than memorizing formulas.
A 70th percentile ERB score is not the same as a 70th percentile state test score. You're competing against private school peers — set realistic expectations.
CTP results break down by subject area. Use them diagnostically — identify which section is below your child's other scores and focus tutoring there.
Study Materials
Handpicked study guides to complement your online practice. Affiliate links — we earn a small commission at no extra cost to you.
The Gifted Child's Guide to Private School Testing
Comprehensive guide for navigating private school assessments including the ERB CTP, ISEE, and SSAT.
Verbal Reasoning and Reading Comprehension: Grades 4–6
Focused practice on the two skills that most heavily influence ERB CTP scores at the upper elementary level.
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ERB CTP 5 Guide: What Private School Parents Need to Know
How the ERB works, what scores mean against the independent school norm, and how to interpret your child's results.
Read article → ComparisonPrivate School Testing: ERB vs ISEE vs SSAT Explained
The three main assessments used by private schools — what each one measures and when schools use each.
Read article →Common Questions
Achievement test used by independent schools to measure reading, verbal, and quantitative ability against a private school peer group.
Grades 1–11, with different levels for each grade band.
Scores are compared to other independent school students nationally — a harder comparison group than public school norms.
Schools use CTP to guide curriculum, identify students needing support, and sometimes for placement decisions.
CTP measures current achievement; ISEE/SSAT are admissions tests. CTP is administered by the child's current school, not by the applicant.