What is an SAS Score? Understanding Standardised Scores in the 11+ and ISEB Pre-test

If your child is preparing for selective school entrance exams such as the ISEB Pre-test or the 11+, you will likely come across something called an SAS score.

Many parents find the scoring system confusing at first. Instead of seeing a percentage or a raw mark, results are often reported as numbers like 100, 112, or 124.

So what exactly does an SAS score mean?

In this guide we explain:

• What SAS scoring is

• Why schools use standardised scores

• What the average SAS score is

• What counts as a strong result

• How SAS scores are calculated

Understanding SAS scoring can help parents interpret their child’s results more clearly and set realistic expectations for selective school admissions.

What Does SAS Stand For?

SAS stands for Standard Age Score.

It is a scoring system designed to compare children fairly, even when they are not exactly the same age.

In many school entrance exams — including those produced by organisations like GL Assessment and the Independent Schools Examinations Board (ISEB)  — results are standardised so that performance can be measured relative to other pupils of the same age.

This helps ensure that younger pupils within a year group are not disadvantaged compared to older pupils.

Why Do Exams Use Standardised Scores?

Many entrance exams use standardised scoring because raw marks can be misleading.

For example, imagine two pupils take the same maths test.

• Child A scores 40 out of 50

• Child B scores 42 out of 50

At first glance, Child B appears stronger.

However, if Child A is almost a year younger, their result may actually represent a stronger performance relative to age.

Standardised scoring adjusts for this.

SAS scores therefore provide a fairer comparison across candidates.

What Is the Average SAS Score?

In most standardised tests used for school admissions:

The average SAS score is 100.

This means:

Scores are typically distributed along a bell curve, meaning most pupils score close to the average.

Only a smaller proportion achieve very high scores.

What Is a Good SAS Score?

What counts as a “good” SAS score depends largely on the school your child is applying to.

For highly selective independent schools or grammar schools, competitive applicants often score 110 or higher.

For the most competitive schools, successful candidates may score 120 or above.

However, it’s important to remember that admissions decisions rarely rely on test scores alone.

Schools often consider:

• interviews

• school reports

• reference letters

• additional assessments

SAS scores are simply one part of the admissions picture.

How Are SAS Scores Calculated?

Standardised scores are calculated through several stages.

1. Raw Score

First, your child receives a raw score based on how many questions they answered correctly.

For example:

40 correct answers out of 50.

2. Age Adjustment

Next, the score is adjusted based on the child’s exact age in months at the time of the test.

This step ensures younger pupils are not disadvantaged.

3. Standardisation

Finally, results are compared against the performance of a large sample group of pupils who previously took the same test.

This statistical process converts raw marks into a standardised score centred around 100.

Why Two Children With the Same Marks May Get Different SAS Scores

One of the most surprising aspects of standardised scoring is that two children with identical raw marks may receive slightly different SAS scores.

This happens because:

• they may be different ages

• they may be compared against different age groups

• statistical scaling may adjust results slightly

While this can seem confusing, it is designed to ensure fairness across large numbers of candidates.

SAS Scores in the ISEB Pre-test

The ISEB Pre-test uses standardised scoring to measure academic ability across four subject areas:

• English

• Mathematics

• Verbal reasoning

• Non-verbal reasoning

Because the test is adaptive, the difficulty of questions changes depending on how a child performs during the assessment.

This helps generate a more accurate measure of ability.

Many independent schools — including institutions such as Eton College and Harrow School — use these results to decide whether candidates should progress to interviews or later admissions stages.

SAS Scores in the 11+

Standardised scoring is also widely used in 11+ exams, such as The Kent Test.

Many grammar school entrance tests — including those administered by providers like GL Assessment — convert raw marks into SAS scores before results are released.

In some areas, schools may combine scores from multiple papers such as:

• English

• Mathematics

• Verbal reasoning

• Non-verbal reasoning

These combined scores are then used to determine whether a pupil meets the grammar school eligibility threshold.

Why Understanding SAS Scores Matters for Parents

SAS scoring can feel confusing at first, but understanding it helps parents interpret results more accurately.

Instead of focusing solely on percentages, SAS scores show how a child performs relative to their peers.

This is particularly useful when evaluating:

• whether a score is competitive for a specific school

• whether a child’s strengths lie in particular subjects

• how preparation strategies should be adjusted

Practising for Tests That Use SAS Scoring

Because SAS scores depend on relative performance, the best preparation focuses on developing strong core skills across multiple subjects.

Practice should include:

• maths problem solving

• reading comprehension

• verbal reasoning techniques

• non-verbal reasoning patterns

Exposure to realistic exam-style questions also helps children become comfortable with the structure and pace of selective school tests.

At White Dot Education, our online practice platform allows students to:

• practise maths, English and reasoning questions

• experience timed exam-style tests

• receive instant feedback

• track their performance across subjects

Structured practice helps pupils develop both accuracy and confidence before sitting the real assessment.

Final Thoughts

Standard Age Scores (SAS) are designed to provide a fair and reliable way of measuring academic performance in selective school entrance exams.

While the numbers may seem unfamiliar at first, the key idea is simple:

A score of 100 represents the average. Scores above 110 are strong, and scores above 120 are typically considered very high.

Understanding how SAS scoring works can help parents interpret results more clearly and support their child’s preparation effectively.

With the right preparation and exposure to exam-style questions, children can approach these assessments with confidence and perform at their best.

Understand your child’s current attainment and SAS by starting with a free baseline assessment.