If you do really well in those three courses, you probably won't need to retake any of them. Even if you do take them again, they only take the average of the two (correct me if I'm wrong since I've never retaken a course) so it wouldn't help much?
If I were you I'd just ace anat 391, micb 202, and stats 200. I wouldn't bother retaking any courses. If you do well in those three courses I think you would raise your average by about 3% if not more?
Assuming that you did not take chem 233, 235, biol 201, bioc 300 (equiv. to biol 201 + bioc 302):
I'd take chem 233 in the summer (my friend did this and he got 90%+ but it's pretty intense) and then do biol 200 + bioc 302 (or bioc 300), chem 235 this september. You should be fine!
Some people got in with a 72% average but they have really high PCAT + ECs etc etc...