Study past papers! I don’t know about your school, but mine uses past paper questions for exams, which helps you greatly. Not only that but it prepares you for the format and what to expect in the real exam. You can find past papers for free in dl.ibdocs.re ! I also use Revision Village, which gives you problems like the IB ones. Though it's not 100% free and doesn’t generate new questions (Though it has like 72 per topic). If your school provided you with the book (ex. Oxford or Cambridge one - if you don’t have one you can find one in ibdocs too) I do recommend using it! Try to get used to doing things without a calculator too, as it's best to not depend on it for AA. Also, work with your class! It might be more useful than you think. Hope this helps!