Urgh, revising for Geography is soul-destroying. It's boring as hell.
I hope biosphere is optional, otherwise I'll have a fit. I might be one of the few people that actually like atmosphere, so I wouldn't mind that being compulsory. Hydrosphere can be compulsory as long as it asks me the formation of meanders. For the prelim, I spent an age perfecting my meanders descriptions, only for the stupid question to have a gay diagram of a drainage basin that you needed to label.