Your teacher should have provided you with a set of workable questions to prepare yourself for them. If you're stuck with any of those, post them over here, explain what you tried before relying on MHF, it turns out a big mistake if you let other people pull you behind them rather than guide you along your way.
But I feel like giving you a small bit of help to get you started:
Trigonometry - Wikipedia, the free encyclopedia
This topic obviously deals with the basic and more advanced areas of Trigonometry. Reading the first paragraph should be enough to let you identify your current problems that are related to Trigonometry and post them away to the community to have them aid you in your studies.
Good luck ;D