It's not quite correct that 4 subjects are used to calculate the overall scores. Details are in the sticky about exam scores near the top of this section:-

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Further information on how the total candidate score is calculated:-

There are 2 papers. All of the questions in both tests are consolidated into either an English/VR, NVR or Numerical classification and marked. The raw scores are then converted into 3 standardised scores for each respective category and then Age Standardised. (See article on Age Standardisation linked from the home page of this site).

The actual number of questions may vary year by year, but in 2005 for example there were 100 Eng/VR questions, 82 Numerical questions and 70 NVR questions.

The 3 Age Standardised Scores are then added together to give a total composite score. You can see, for example, that the minimum composite pass score was 347 for Camp Hill Boys in 2005 - this was the lowest total score for the last child to enter the school in Sept 2005. This is equivalent to an average Age Standardised score of 116 for each of the categories. (3 x 116=348). Obviously 347 (or 348) is the key and you can achieve this via a variety of ways e.g. 107+ 112+ 129

An Age Standarded score of 116 is equivalent to about 86th candidate percentile for each particular paper. ie 14% of candidates taking that paper achieve a score of 116 or higher.

For typical 11+ exams, the maximum standardised score is usually 140, however for the KE exam set by the Univ of Durham this can be higher. The minimum is 70 and the average (50th percentile) is 100.