I am a junior this year, and I still have some thoughts on your question. I don't know what your major is. I study communication. If you are a science student, you should be similar to me. I don't think freshmen and sophomores need to focus too much on their studies, which is certainly compared with high school. You should focus on two courses, mathematics (advanced mathematics, linear algebra, probability theory and mathematical statistics, and some majors also have complex variable functions) and English to lay a good foundation. What else is an introduction to life science, college Chinese, all nonsense (some schools involve professional courses in their sophomore year, which should be very curious). Of course, if you want to get a scholarship, you should study hard in every course. After all, high GPA is king. What were you doing in your freshman and sophomore years? Of course, if you want to do more things you like, you'd better cultivate some skills. Take part in more activities and make more friends. Don't waste time, don't, the senior regrets it now. Every class in junior year should be studious, so don't waste time playing at this time, it's time to converge. Later, I took the postgraduate entrance examination and prepared for my graduation internship. You'll find out later.