Congratulations from a fellow fresh student. Remember to keep cool and have fun there. If it's your first time to receive higher education, it might be tough on you the first year or so. I have no idea - I've only lived through a year previously - but people say that beyond that, things get a lot easier.
All four years were super hard for me. I had no fun at all. I think many people have trouble staying organized and on schedule because there is so much more freedom and so little oversight compared to high school. For me at first I had a tough time because I had absolutely zero study skills and then later it was because I was in the wrong program (they belled the grades, only awarded 1 or 2 As per class and 33% were forced out of the program every year). I knew I wanted to go to grad school so had to get that A in every class. Surprisingly enough, grad school was so much easier and so much more fun.