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.
Side note: 100% of students who joined my tuition since J1 get A or B in 2019 alevel.