United States
Hong KongWhy your practice score is not your exam score
A practice percentage is a percentage on that bank. The real exam is scaled, with an unpublished raw cut, so no practice score predicts a result. Its value is as a trend line and a diagnostic, not as a forecast.
People treat a mock score as a prediction. It is not one, and understanding why makes it more useful rather than less.
Different scoring systems
A practice bank gives you a percentage of questions answered correctly. The real exam converts your raw score to a scale, with 75 required, and does not publish the conversion.
So the two numbers are not on the same axis. Eighty per cent on a mock does not mean a scaled 80, and there is no arithmetic that gets you from one to the other.
Different question pools
Practice banks are usually easier than the live exam, for a reason that has nothing to do with intent: the questions are not psychometrically calibrated, they are often reused between candidates, and they tend to cluster on the most-written-about topics.
They also do not follow the blueprint weighting exactly, which is why a bank can leave you well practiced on temperatures and short on employee health.
A candidate scores 85 per cent on a bank they have worked through twice and books the exam. Much of that 85 was recall of those particular questions, not of the rules behind them. The live form draws different questions from the same rules.
How to make a mock honest
- Full length. Eighty questions, not twenty.
- Timed. 120 minutes, in one sitting.
- No notes, no pausing, no looking anything up.
- Questions you have not seen before.
- Scored without giving yourself the benefit of the doubt.
A mock that fails any of those five is measuring something, and it is not readiness.
What the score is actually for
Two things. A trend across several mocks, and a breakdown by content area.
The breakdown is the valuable half. A single 78 tells you very little; a 78 with most misses in employee health tells you exactly what to do next.
Why the target here is 80 per cent
Because nobody can honestly tell you the real threshold, so the margin has to cover the unknown, a harder-than-average question draw, and the difference between a familiar bank and a live form.
Twice, not once, because a single good score is as likely to be a favorable draw as it is to be competence.
If your score is high and you still feel unready
Trust the feeling enough to test it. Take a fresh mock on questions you have never seen, timed, and see whether the score holds.
If it does, book. If it drops ten points, you have just learned something the first score was hiding.
Common questions
Does a practice test score predict the real exam?
No. Practice banks report a percentage and the real exam is scaled with an unpublished raw cut, so the two numbers are not on the same axis and no arithmetic connects them.
Why are practice banks easier?
They are not psychometrically calibrated, questions are often reused, and they tend to cluster on the most-written-about topics rather than following the blueprint weighting exactly.
What makes a mock honest?
Full length, timed at 120 minutes, in one sitting, with no notes, on questions you have not seen before, scored without any benefit of the doubt.
What is a mock score actually useful for?
A trend across several attempts, and the breakdown by content area. The breakdown is the valuable half - a 78 with most misses in employee health tells you exactly what to do next.
Why is the target 80 per cent?
Because the real threshold is unpublished, so the margin covers that unknown plus a harder question draw and the gap between a familiar bank and a live form. Twice, because one good score can be luck.