The CSSE test — a unique English & Maths format set by the Essex consortium. Whizlo's adaptive mocks mirror Essex CSSE, with instant marking, percentile ranking and an AI tutor for every wrong answer.
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Know exactly what your child will sit — then practise that exact format.
Essex CSSE sets the Essex 11+. Whizlo mirrors its structure across Maths, English, Verbal Reasoning and Non-Verbal Reasoning, with timing and scoring matched to the real paper.
See where your child stands against the schools you're aiming for.
Chelmsford (boys)
Aim for ~90% on a mockSuper-selective — top of the cohort only.
Chelmsford (girls)
Aim for ~90% on a mockSuper-selective.
Colchester (boys)
Aim for ~88% on a mockColchester (girls)
Aim for ~87% on a mockSouthend
Aim for ~82% on a mockSouthend
Aim for ~82% on a mockIndicative only — real cut-offs vary each year.
Everything your Essex 11+ prep needs, in one subscription.
The CSSE test — a unique English & Maths format set by the Essex consortium. In practical terms that means your child sits Essex CSSE, testing Maths, English, Verbal Reasoning and Non-Verbal Reasoning. Whizlo configures its mock papers to match this format so practice mirrors test day.
Most families in Essex begin in Year 4 or early Year 5, giving 12-18 months of steady practice. Whizlo adapts to your child's current level, so starting earlier simply means a more gradual build-up rather than last-minute cramming.
Whizlo's mocks mirror the Essex CSSE structure, timing and question types. Each mock is auto-marked with an instant percentile so you can see how your child compares, plus indicative benchmarks for Essex grammar schools such as King Edward VI Grammar (KEGS) and Chelmsford County High.
Whizlo tracks readiness against well-known Essex selective schools including King Edward VI Grammar (KEGS), Chelmsford County High, Colchester Royal Grammar School, with an indicative "aim for" percentage on each mock. Real cut-offs vary every year, so we treat these as motivating guides rather than guarantees.
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