Title says sorted according to GPS not boarding schools only which means this is all schools sorted in order

I also wonder why never see srjkc on the list

Harder than BM?

Is it because BM is graded on a curve that had a lot of people vs mandarin which has less, making the average curve higher?

BI yes very the simple because spm level is about middle school English at the most in English speaking countries

BM not as simple but because it's graded on a curve like BM and many people take it (same can be said for BI), it brings the average down so easy to score.

People can study better

Study = do past year questions

During my time, you can look at the answer options and guess the question after doing so many past year questions.