And it really depends on the person - everyone will have subjects that will be heavy on workload.Maths...Most Sciences?
Business Studies is okay, its not too intense imo.
With proper organisation, workload should be thinned out evenly and not too difficult to maintain.
i suspect to get the best marks, would have to be in any HSIE subjects, english and physics. Dunno bout chemistry, i wrote most of the stuff on the spot and w/o notes and got a 94 for the exam, though i think i'm an exception according to many people.Which subjects have the most workloads where you requires a lot of writing and will mean you will need a shite load of books to accommodate such subjects.