In case you aren't admitted to any new courses you're on the waiting list for, you'll still have backup classes. Don't miss your first discussion session even if it is held before the first lecture because you may be dropped otherwise. Some of your classes may have changed their times or locations, or may even have been cancelled. CalSO counselors can help you find alternatives. The staff can let you know which courses are still accepting student enrollment, if classes require a course entry code, and how many students are on a waiting list.
Professors are generally very open and willing to talk about anything pertaining to the class.
Or, if you're too intimidated to speak to an actual professor, GSIs usually understand what you're going through and can be incredibly helpful. Intended Political Science and History Make sure to take advantage of office hours both with your professors and your graduate student instructors. I was sure to talk to advisers in my major during my first couple of years here. It paid off because due to my good grades, I got out of really hellish classes, which were otherwise listed as requirements for my major. They can be quite lenient and very helpful.