This thread is lolworthy. Whilst I agree that 4u is overhyped (english adv is probs harder), it is by no means easy. q1 and 2 of the exam are basically gift marks, q3 and 4 are also generally fairly easy, it's only when you start getting to around question 6 that shit gets difficult. q8 is often mindfuck.
OE is right, if you are dedicating >50% of your study time to maths and are doing 4u, you are digging a grave for yourself. In fact, I probably spend the least time on maths. Now that we've finished the courses, I simply do past papers in class, and go home and do other stuff. Maths is a subject which you can do in a distracting environment, and one of the only ones which can be done so, so you should take advantage of this. If anything, you should be spending more time on english than anything else.