Get the foundation right in form 4, form 5 will be peanuts for you, and a good foundation will help u in higher education. but its not tat hard, just Addmaths you'll prob struggle in the early part, then it'll be fine after a while. I never liked sej and moral, so for me its hard all the way till form 5.

Science subjects are ok for me, grasp the concept and apply it. I never took anything as 'dead' in science, so understanding + bit bit of memorizing is how i study bio chem and phys. Addmaths needs practice, once you get the idea on how to do those questions then you'll be saying "oh this ain't that hard =)" (Questions in tests/exam differ just a bit from what you do in exercises, just they twist a bit here and there, so you'll need to twist your brain here and there just to see that it leads back to the same basic concept)

all the best. =) btw, i think form 5 is more of a honeymoon year for me instead. xD like I said, if you get the foundations right, form 5 will be easy for you. Vice versa.