As alevel is easier than school internal exams, students often improve by 2 to 3 grades from their prelim results even without tuition.
So how to better gauge the value-added by tuition? Using percentile improvement is one way.
Below are some illustrations based on my students’ 2019 alevel results:
| 1. | Student scored 16 percentile in school internal exams before joining tuition. | Her school distinction rate in 2018 is 68%. So to be on track for distinction, she has to improve to at least 32 percentile to get A in alevel | Student got A in alevel. So there is value add of at least 16 percentile. |
| 2. | Student scored S grade in J2 MYE before joining tuition. | S grade is around 20 percentile in her school. Her school distinction rate in 2019 is 65.5%. So to get A, she must have improved to at least 34.5 percentile. | Student got A in alevel. So there is value add of at least 14 percentile. |
Percentile improvement is not easy to achieve. Imagine running the alevel marathon, one has to overtake more than 16% of people along the journey to get A.
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