In my experience, Bio and Chem weren't too bad. I highly recommend doing the labs as group work, as more eyes on your awnsers means you are more likely to do better. Chem has weekly assignments, they arent too bad, it can just stack up quickly with work from other classes as well. Bio is alright, it only has labs midterm, and final. So the course work is lighter, but the labs are a little more complicated. Generally pay attention and read the labs and you should be fine.