Balancing fraternity life with classes

I’m pretty much set on going to KU in the fall, however I also plan on going into pre-med studies. The classes set up are rigorous science classes which I assume will be very time consuming. However I also want to make new friends and join a frat. I don’t want to be that guy who goes through college without really experiencing the big party scene and so on. I was wondering if my grades would suffer and if so, what Greek life is like (i.e. what do the pledges do, do they have enough free time for a lot of studying, how much time do they spend with their brothers, etc.). Thanks!