I'm taking biochem now in a 6 week course while studying for the MCAT and working with research fellowships. Definitely doable, and if you want to maintain an A study 1-2 times a day, although I've been getting away with every other day because I have awkwardly good memory. I feel like it's all memorization and a lot of it seems like bits and pieces I've learned in other classes, while a lot a also new. Also, say goodbye to most of your social life for a few weeks! Good luck 🙂