Which courses to take while studying for the MCAT

Currently stuck between physics 2, genetics, and physiology. I will probably keep physiology regardless because i have read it is pretty useful, so I need one more science course. But, between physics and genetics:

Genetics definitely seems like useful but easier so I feel like i could manage MCAT studying better. However, physics 2 isn't really a strong suit for me and I am not sure how to go about self studying for it. It is also notoriously hard at my school and I am worried I will sacrifice MCAT for gpa preservation.

What should I do? Is it possible to self study physics 2, and if so, how did you do it? Should I go with the easier class or take the harder class that may help me prep?