These things may seem like common sense but you will probably find yourselves dealing with these once you get settled in to school.
1. Study - In high school I got a 3.6 GPA in honors curriculum not doing sh*t. I occasionally skipped class, didn't do homework unless it was necessary, and didn't spend a single minute studying. A lot of you probably did this as well. In college classes are harder, but if you manage your time well it won't be too bad (unless you are a pre-med or something). Set aside a block of time each day to study/get your sh*t done, and strictly adhere to this block of time. This way, you won't find yourself procrastinating (dig yourself in a hole) and will have free time to do other stuff when not running.
2. Read- When a teacher assigns you a reading assignment for homework in high school to most kids this basically means no homework. In college the curriculum and tests is largely reading based, you paid a bunch of money for those books, so suck it up and read in your allotted study time/free time.
3. Go to class - no-brainer here. "good notes" from a classmate is no substitute for actually going to class and interacting with a professor who is (hopefully) an expert in their field.
4. Running is important but there are other things to do that make college a great experience. You shouldn't go out and party the night before meets, but if you were a "good kid" in HS dont be afraid to meet people, go out, and get sh*tfaced every now and then. You will have fun and make memories to last a lifetime. Just because you "party" does not make you a horrible kid and if you are smart about it you can do just fine with your academics & running. Its all about moderation and time management in college, master this and you will prosper.
Tips
*make friends with any sprinters/football players on your track team - you can go with them to the good parties (hot girls)
*girls - college girls are different than HS girls, they are away from mommy and daddy and want to have fun(sex). Be confident, hygienic, and learn to embrace rejection. Follow these rules and you will get some poon.
*don't be that dumb freshmen who tries to be a workout stud, go with the pack - you will tire yourself out long term and probably die a few intervals in anyways, listen to the coaches and embrace the training plan
*Unless you were a top 10 nationally ranked stud in your event in HS its probably ok to be average/midpack. If you are in D1 especially you will get smoked by plenty of runners who are way better than you. You will learn and get better with time and hard work.
*A good rule of thumb when partying is to "keep it to the weekends". The week is for work, the weekend is for play (given there are no meets). If you are at a big college you will most likely be able to party ANY day of the week, Thirsty Thursdays, Wasted Wednesdays, etc... stay away from this.