Tutoring11+

CSSE standardised score calculator

For the Essex 11+. This uses the actual formula and the actual cohort figures CSSE publishes in its annual Standardisation Report, so for the years listed it is not an estimate - it is the same calculation the consortium ran.

How do we know this is right?

CSSE publishes the real method. Unlike every other 11+ test in England, CSSE puts out an annual Standardisation Report giving the exact formula and the actual cohort figures. For a past year we are not estimating. We are running the official calculation.

We tested it against real children. CSSE also publishes the marks of every candidate. We ran all 5,103 who sat the 2026 test through this calculator and compared our results with CSSE’s own published scores. Across the whole range our largest disagreement is 0.54 of a point — and across the middle 90%, 0.25 of a point.

We test for the mistake everyone else makes. The CSSE formula ends with a ×1.5 multiplier that is easy to lose — it renders as “15” when text is copied out of the PDF. Drop it and every child looks like a fail, including one with full marks. Our test suite refuses to build if that ever happens here.

Where we can’t know, we say so. A threshold that has not been set yet is one we will not invent. Kent’s test is run by GL Assessment, which publishes no cohort figures at all, so our Kent tool gives an honest band rather than a confident number. Any tool that gives you an exact Kent score has made its constants up.

The full method, and what we still can’t know →

35 marks in English was worth 114.2 in 2020 and 100.0 in 2026. Both figures are CSSE’s own. It is why a raw mark on its own tells you almost nothing, and why this calculator asks which year you are scoring against. Every year’s figures, and what moved them →

Why this one can be exact

CSSE is the only 11+ test in England that publishes its method. Every year it releases a Standardisation Report giving the cohort mean, the standard deviation and the age adjustment for each paper, along with every candidate’s raw and standardised scores. Feed those numbers back into the published formula and you get the official answer.

Everywhere else - Kent, Buckinghamshire, anything GL marks - those numbers are confidential and refitted each year. There, the honest answer is a range, which is what our Kent Test calculator gives you.

The formula

Each paper is standardised on its own:

standardised = ((mark − cohort mean) ÷ standard deviation) × 15 + 100

Then an age adjustment is added, worked out from how many days younger the child is than the oldest in the year group. The two papers are added, and the result is multiplied by 1.5. A child born on 1 September who scores exactly the cohort average on both papers ends up on 300 — which is the check CSSE itself states, and a useful way to spot a calculator that has dropped the 1.5.

Years available

2026, 2024, 2022, 2020 entry. Constants for a given year are published in the October after the test, so the current year cannot be calculated until then — the cohort statistics do not exist until the cohort has sat the paper. Any tool claiming to give you this year’s standardised score before then is guessing.

Sources