1. Universities basically don't care if you are late for class or leave early. Don't listen in class, nobody cares about you, and there won't be much homework after class, so you should know how to be self-disciplined and don't relax yourself too much.
2. University teachers don't lecture books in detail like high school teachers, and then take exams every three days to consolidate them. They are basically self-taught, so you should know how to learn and have your own learning methods.
In addition, college is no longer a blind study, but a transition for you to enter the society. At this time, you should start planning your future development, such as CET-4 and CET-6, which is very useful for finding a job in the future. Then you should participate in scholarships, community activities, veteran cadres and other activities that can add highlights to your resume and improve your ability. Then you can earn some money by taking a part-time job, or cultivate your working ability by taking a part-time job. And plan the direction after college: going abroad? Postgraduate entrance examination? Baoyan? Looking for a job is all prepared as soon as possible.
Of course, the university is a very open and free place. Many hobbies can be developed here, and playing is also very important.