The Complete Guide to the ISEB Common Pre-Test
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Securing a place at premier independent senior schools such as Eton College, Harrow School, St Paul’s School, City of London, or Brighton College—requires navigating one of the most critical hurdles in the UK independent education sector: the ISEB Common Pre-Test.
Conducted primarily when pupils are in Year 6 or Year 7 (ages 10 to 12), this standardised online exam acts as an initial academic screen for 11+ and 13+ entry. Understanding how the assessment works, what skills it tests, and how schools evaluate candidates is essential for families targeting elite boarding and day schools.
What Is the ISEB Common Pre-Test?
The Independent Schools Examinations Board (ISEB) Common Pre-Test is an online, age-standardised assessment designed to measure a pupil’s academic attainment and cognitive potential.
Instead of sitting bespoke entrance exams for every single independent school on a family’s shortlist, candidates sit the ISEB Pre-Test once during an academic year. The standardised results are then shared directly across all participating schools to which the pupil has applied.
The Four Test Modules
The exam consists of four distinct modules, taking roughly 2.5 hours in total to complete. The tests are entirely multiple-choice and are taken online.
1. English (25 Minutes)
The English paper evaluates a student’s reading comprehension, vocabulary, and technical language skills.
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Reading Comprehension: Pupils read unseen passages and answer questions testing literal retrieval, inference, authorial intent, and vocabulary in context.
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Grammar and Punctuation: Assesses sentence structure, correct punctuation placement, spelling accuracy, and word-class identification.
2. Mathematics (50 Minutes)
The Mathematics module tests core concepts aligned with Key Stage 2, extending into early Key Stage 3 logic for higher-performing candidates.
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Core Topics: Arithmetic fluency, fractions, decimals, percentages, ratio, basic algebra, geometry, and data handling.
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Problem-Solving: Multi-step word problems requiring pupils to extract mathematical data and choose the correct operations under time pressure.
3. Verbal Reasoning (35 Minutes)
Verbal Reasoning evaluates linguistic agility, problem-solving through text, and vocabulary depth.
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Key Question Types: Antonyms and synonyms, ciphers and code-breaking, word pairs, odd-one-out groupings, and sentence completion logic.
4. Non-Verbal Reasoning (32 Minutes)
Non-Verbal Reasoning assesses how well a child can analyse visual information, detect geometric rules, and manipulate shapes mentally.
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Key Question Types: 2D shape matrices, figure series, spatial rotations, line symmetry, and 3D cube folding.
The Adaptive Testing Algorithm Explained
A fundamental characteristic of the ISEB Common Pre-Test is that it is adaptive. The test algorithm adjusts the difficulty of each question based on the candidate's previous answers.
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If a student answers a question correctly, the next question becomes more challenging.
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If a student answers incorrectly, the system presents an easier question to recalibrate.
Because higher-difficulty questions carry greater statistical weight when calculating the final Standardised Age Score (SAS), performing well on early questions elevates the student into a higher scoring band early in the test session.
Preparing for adaptive online assessments demands speed, accuracy, and confidence. Email us today at info@exceptionalacademics.com to see how we can help.