If you have time you should really try to do all of the practice tests for the math portion in the hesi study guide.. It helped me so much. They aren't hard, just time consuming. It's worth it though! Definitely study the vocabulary.. I highlighted the ones I wasn't very familiar with and studied those words the most. Unfortunately, the A&P portion in the study guide really doesn't help prepare you for the test. Something that might help is going over some of your old notes from A&P 1 and 2.. or maybe even skimming through your A&P textbooks. The hesi just asks such broad questions about A&P that its hard to say what to study exactly. The grammar part was probably the easiest section and the comprehensive isn't too difficult but they do ask a couple of trick questions so you really have to pay attention to what you're reading. My eyes got so tired from all of the reading from that portion so I wouldn't recommend saving it for last when you're taking the test. Good luck!! I'm sure you will do awesome.