Jot down questions that you have. Don't just put a question mark by the problem and don't erase your work. Again, this will really help as you prepare for the final. You are no longer in high school. The material is harder.
Expectations are higher.
Material will be covered 2 to 3 times faster than in high school. Class time is at a premium. Not every kind of example can be worked in class. No one learns mathematics without doing the work. The key to success in any mathematics course is to do at least the minimum assigned work, and to do it on schedule.