Difficulty Level of Microbiology and Statistics?

I wanted to know if anyone knew the difficulty level of microbiology and statistics? Would it be better to take it during a full semester or can I take it as a summer course (5-7 weeks)? I’m trying to plan my schedule but I don’ know what the best option would be.

If you have any doubts about your ability in these subjects I would recommend taking only one if you do it over the summer.