Understand how to do all the questions on CAPA, and you should be good. That means you should be able to solve every question by yourself and easily. I suppose the textbook practice problems aren't a miss, either. Also, about 60% of the questions are CONCEPT based, so make sure you read the textbook. There's a section on conceptual questions, too, so go through that.
That's all I can recommened. And pray for a load of luck. Felix Felicis would be best but that's academic dishonesty.