Hi
Ive been reading posts and seems like most ppl had a lower gpa bcoz of a bad semester or bad year.For me its a bit different,my first yr was engineering and i switched,so i cud explain that.After that,in life sciences(and chem double major) the trend was most mid 70s,1 or 2 80s and one low 60 or even a high 50 which wud ruin the gpa.Now the overall avg probably improved over the 2-4th yr,but i always had one really bad course each yr,how do i explain that during the interview!!!???
The real reasons range from plain procrastination,bad exam schedule,or a hard course to begin with,something i didnt like it but had to take.

btw,my gpa is around 3.1ish with 2.9 on the science courses(im just guessing it since the grades for this semester arent out yet).