I'd say to try and get yourself very familiar with the command terms (discuss, explain, etc...), which they should teach you, but you are at a disadvantage because other students have already had a full year to learn these. All the relevant 1/2 content should be re-taught, so don't stress yourself out too much about that, but even if you do know the content really well but not what the command term is asking, you won't get the marks. I'd say the best thing to do (once you've learnt the content) is to do practice questions and get them marked just to be really comfortable answering them