for maths, my strongest subject, just crammed the night before in each exam, 99% UMS
for chemistry I was convinced I didnt want to do it anymore so I didnt revise at all, 78% UMS
english and psychology were a waste of time so I looked over the notes the night before the exam, 79% and 78% UMS respectively
dropped english and psychology and now do maths, futher maths and chemistry (actually going to put effort in for chem this year though)