Are you afraid not to be good in your classes? Maybe because you will be in a different country, with a different language, and a different culture. Whatever it is, do not worry. It is actually not that hard to be a good student in American colleges. Most of the international students that I have known in the U.S.A. have been good students.
Let me give you tips and information about how your classes will look like.
The first thing to know is that, as international students, you will most likely have an exam before classes start. This exam will aim at knowing your capacities and understanding. After evaluating your level, you will know if you can have college classes during your first semester, or if you need to take English classes to perfect your understanding.
The problem is that if you need to take classes to improve your English, you will have to pay more than expected, so ask your advisor about that.
This is what surprised me the most. Most of the exams and quizzes you will take are multiple-choice questions. In France, I was used to taking exams with essay questions, whereas they are only a few in the U.S. Plus, some of these exams and quizzes are taken at home and online.
Also, the grading will probably be different from what you know. The way it works is that the grades your get on your quizzes, exams, projects, etc., earn you points. In the end, your grade will be the percentage of points you obtain. Usually, if you have more than 93% of the total point, you get an A. You can get more information about the grading system here: https://www.mooxye.com/blog/en/american-grading-system-and-gpa/
Meet with your professors:
Guys, even though you understand the class and you are not stressed about it, meet with your professor. It will give you an opportunity for both of you to discuss, get to know each other and to build a network.