# T-score psle how to calculate

How the T-score is Calculated?

In Singapore, students taking their PSLE ​​in 2016 to 2020 will still be affected by the T-Score system.

Short of "transformed score", the Primary School Leaving Examination aggregate score is the sum of the T-scores in all four subjects - English, Maths, Science and Mother Tongue.

It is an adjusted score that shows how well a pupil does relative to his peers. It is calculated using the following formula:

• T-Score = 50 + [10 x (raw score - mean) / standard deviation]

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• Raw score shows how good a pupil is in the subject.

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• Mean refers to the average mark scored by the cohort.

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• Standard deviation measures the "spread" of marks among the cohort.
If the mean is 55 and standard deviation is 10, it would mean that the cohort scored 10 marks around the average, from 45 to 65.

So if a pupil scores 80 in a subject, the average mark scored by his cohort is 60 and the standard deviation is 14, the T-score for the subject will be:

50 + [10 x (80-60) / 14] = 64.29

This way of ranking has been criticized for fueling unnecessary competition among pupils, who have to outdo one another to get a better score.

Notes to Parent

• PSLE T-Score will be remove from 2021; this will impact 2016 pupils who start schools in Primary 1.

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• Replace with a new scoring system similar to 'O' and 'A' level grading system.

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• Purpose is not to grade students how well they do in relative to their PSLE ​​peers.