Wait a minute, are you trying to give advice on medical school but haven't even gone to medical school yet? I cannot really tell considering you have no medical student tag on your profile, nor a pre-med one.
While everyone will end up in a similar place towards the END of pre-clinical years, the workload up until that point is tremendous. Taking classes like biochem, genetics (which is probably a pre-req at many places), immunology, microbiology, etc. while in undergrad will make your life EASIER in medical school.
Example of this concept:
Tommy is a brand-new M1, freshly accepted and ready to rock. In undergrad Tommy placed emphasis on his English degree, which is his passion outside medicine. This garnered the interest of the admissions committee so it did help him stand out from the rest of the crowd.
Now, Tommy didn't take any upper level biology classes such as immunology, microbiology, pharmacology, molecular biology, etc. Sitting through his first week of classes, Tommy realizes that medical school is a whole new ball game. There are 4 lectures worth of difficult material pretty much everyday. It's not like undergrad where fluffy filler courses make it easier to prioritize studying, although, he wishes it was because he studies constantly. Tommy looks at his lectures and knows almost nothing he is reading, and the professor goes through the information in a way that is much like drinking water out of a fire hose.... without really touching the foundational knowledge, but always skipping to key points that may be difficult to understand conceptually, and in massive amounts of slides... sometimes 100+ slides per lecture. Because Tommy doesn't have experience in these upper level type courses, he is forced to self-teach outside of the provided powerpoints with books that many other students don't have to open, let alone purchase, just so he can conceptually learn the material.
tl;dr
OK, so this is by no means the greatest example ever but I think it at least helps me get my point across. You move at a terrifying speed in medical school. It takes awhile to acclimate to this environment, sometimes people aren't even comfortable with it till 2nd year. Having a good foundational knowledge from upper level bio courses will make this hectic transition easier for you, and you will have more free time to relax and cope with all the crazyness that is medical school.