Last time in my school those express students whose sec 2 Maths
results are not that good are to study POA instead of A Maths and I
was one of those who studies POA instead of A Maths. But for us we
never planned to go JC instead so it was not an issue.
In the end when I took an engineering course in poly those who
didn't took A Maths (or failed A Maths in O lvl) were to attend a
preparation course before orientation week...
