Why Has My Child’s Standardised Score Gone Down When Their Raw Score Hasn’t?

A parent recently asked me why their child’s standardised score had gone down even though their raw score was very similar to a previous assessment.

It is an understandable concern.

When entrance exams are getting close, a lower score can quickly feel like a child has gone backwards.

But that is not necessarily what has happened.

Raw scores and standardised scores tell us different things

A raw score tells you how many questions a child answered correctly.

A standardised score is trying to give us more context about that performance.

On the adaptive practice assessments I use, the difficulty of the questions a child answers also matters.

This means two assessments with a similar raw score do not necessarily represent identical performances.

A child might answer a similar proportion correctly but have faced a more challenging set of questions.

Their standardised score can therefore be different.

Adaptive assessments make the percentage less useful on its own

The ISEB Common Pre-Tests are adaptive.

As a pupil works through the assessment, the difficulty of later questions changes according to their performance.

Two pupils are therefore unlikely to experience exactly the same sequence of questions.

The same principle matters when looking at adaptive practice assessments.

Simply asking, “What percentage did they get right?” does not always tell us enough.

I look for patterns rather than one result

When I review a pupil’s assessments, I normally look across several results.

I want to know:

• Are their scores becoming more consistent?
• Where are they repeatedly losing marks?
• Is timing affecting the result?
• Was one particular topic responsible for most of the errors?
• Does the result match what I am seeing in lessons?

One score can tell us something.

A pattern of scores tells us much more.

The detail underneath the score is often more useful

If an English result drops, I want to know whether the lost marks came from vocabulary, inference, grammar, timing or one particularly difficult comprehension passage.

If a verbal reasoning score drops, I want to know whether one question type is responsible for a large proportion of the mistakes.

That changes what we do next.

“Your score went down” is not a useful preparation plan.

“You are repeatedly losing marks on this vocabulary question type, so this is what we need to practise next” is.

Progress is rarely a perfectly straight line

At this stage of entrance-exam preparation, I am looking for increasing consistency rather than expecting every mock to produce a higher score than the one before it.

I want pupils to become more reliable at:

• working accurately under time pressure;
• recognising familiar question types;
• handling difficult questions without panicking;
• learning from repeated errors;
• maintaining their performance across different assessments.

That is much closer to what they will need on the day.

So should you worry if the score drops?

Not automatically.

A lower score can reveal a genuine weakness that needs addressing. It can also be part of the normal variation between assessments.

The useful question is not simply:

“Why did the number go down?”

It is:

“What does this result tell us about what my child needs to do next?”

That is how I use assessments throughout entrance-exam preparation: not simply to produce scores, but to make the preparation more targeted.

I work with pupils preparing for competitive UK independent-school entrance assessments. As current pupils complete their exams over the coming months, I will have some availability for future entrance-exam preparation. If you are considering support for a future admissions cycle, you are welcome to get in touch early.