how to revise for theme questions

I've been revising for character questions in Macbeth, Jekyll and Hyde and An Inspector Calls by learning quotes for each character and analysis for each. For the themes however, first of all, I don't know which themes could come up (I know the obvious ones of course) but also I don't know a good way of preparing for them.

Maybe just learning quotes that I would use for each theme, maybe even re-using ones I had for the character???

Please someone help, thanks