Hmm. Goes without saying know all the theory that you learnt like the back of your hand.
I'm assuming this is a kind of practical sac. Which means you'll want to know how to set up circuits like a boss. More specifically, with the equipment you'll be provided with at school, so make sure you know how to set up a parallel circuit etc. with those. Know how to set up an ammeter/voltmeter, or a multimeter if that's what your school uses.
More likely than not, there's a chance that this equipment is probably going to be older than you, so keep an eye out for any faults that might arise from that (wires that have rusted after being used for electrolysis sacs in chemistry etc.).
There'd probably be simple graphs to draw, remember how variables relate to each other (current and resistance have an inverse relationship etc.)
That's probably all the obvious stuff. Does that help?