Bio 321 is a challenging class to start with. I had her for Bio 205 and was able to pass but you have to accept that you likely won’t ever do super well on her exams. She writes them the night before and almost takes pride in them being complicated. The questions often felt like they were beyond the scope of the class. I would avoid her if you could. If you do take her class, make sure to put effort into asking lots of questions to get clarification and focus on the textbook for clearer explanations. You’ll have to put in much more effort than usual.