Nothing, it can be explained that you are not used to the way of learning in college so far. Many courses in universities are no longer like those in high schools. A book lasts for one or two years, and there are a lot of exercises in the middle. In college, there are generally two small classes, and each class has more content. It is normal for a class like Shu Gao to talk about forty or fifty pages in a class. A good understanding, direct digestion and acceptance in class, there is nothing after class. Otherwise, it is very important to preview before class, so you must read it yourself first, and forget what you don't understand. So now you must change your learning style from passive to active, which is the biggest difference between college and high school. Secondly, self-study is also very important. Many classes in the university are in large classes, and the speed of attending classes is fast, which requires good self-study ability. As for your three-month class now, there is nothing to worry about. I was the first in the hospital when I was a freshman, and I soaked in novels every day. There is no hurry to learn about the teacher's classes now, because I have taken many classes in the three months of college. First, take out the book. From the first chapter, the advantage of engineering books is step by step. Just push out a formula one by one, and then I'll remember it deeply. After reading the book, do the exercises from beginning to end, don't omit the steps, otherwise I will not understand them. Finally, put the book. It takes me ten hours to finish such a book every day, from a week to two or three days. Do it yourself Generally, there is no problem in college exams. Don't worry, it's only now. Now it's relatively simple, and the consciousness of chasing will soon be there. Come on!