okmum:Good students are usually given the following options:I am not so sure if A.Maths is a must for JC.
My understanding is that students can always take H1 Maths in JC, if they have not taken A.Maths at O-Levels.
However, the student may subsequently be limited in his choices for uni, especially engineering courses.
a) Double language, double math, triple science and 1 humanities, or
b) Double language, double math, double science and double humanities
Out of all the subjects, the more deterministic subjects are Math and Science. In other words, if you know the subject matters well, you should be able to tell where your standing in O-level is. This is why many students are spending time to excel in the Science and Math concepts so as to guarantee themselves with 4 A's for L1R5 calculation.
As for languages and humanities, they are not as deterministic as Math & Science. At http://singapore.math-chinese-tutor.com, we only hear of stories about students who did well for English/Chinese/Humanities in Prelim but scored only B's at O-level. We hear much less of such story in Science and Math.
For this reason, it is advisable to be diligent in Math and Science. For last 2 years the standard for Math and Science were raised and A1 is not as easy to obtain as before. However, for students taking double-Math, I would say that you are almost guaranteed of A1 for E-Math if you study correctly. You should be able to get A2 for A-Math too if you start doing revision systematically in March/April of your O-level year.