Don't have an answer for you since my program starts in June as well (actually late May). But, I am taking a few non-anesthesia classes early and can share my thoughts on them...I am currently taking Applied Pharmacology and Research. I was nervous about Applied Pharmacology because I haven't had Pharm for quite a while, and I also had them waive a pre-req of Graduate Pathophysiology just so I could take the course. With that said, the Applied Pharmacology class is not nearly as hard as I thought it would be. I have not worked very hard at it at all and have an "A" in the class thus far. The final is tomorrow, so we will see how it goes! I think you will be surprised at how much you still know (even from classes you took many years ago).
Since our program start dates are so close I was wondering which program you are going to attend? Just curious I guess!