UC Berkeley Major Change Question & Decision

Hey!

So I just got accepted into Berkeley in the College of Letters and Science as Public Health. I was reading some of the requirements and they said that I wouldn’t actually be in the major until I completed all of my pre-req courses once I got there. Does that mean I could complete all of the pre-req courses for a Biology instead since it is in the same college and apply there as that major?

Also, I have never been to Berkeley and because of the timing I will probably not be able to before the SIR deadline. So I am choosing between UCLA, UCSD, and UCB for Biology and LA and SD and Public Heath (or Bio if I can change) for Berkeley. I want to go to LA because is LA and I know I will preform excellently. However, SD seems like a better and more relaxed place to be with the beaches near by and the better looking campus. I really do not know where I should go. Do you guys have any pros or cons for either?