Undergraduate mathematics is divided into advanced mathematics and linear algebra, while junior college only studies simple advanced mathematics. If you want to take the college entrance examination, you should also take linear algebra in mathematics, but please rest assured that the college entrance examination is not difficult in mathematics, and the scope of linear algebra examination is not much. When you are in junior college, you should seriously study the part of advanced mathematics and learn linear algebra by yourself. It is helpful for you to go to the library to find more tutorial books or sign up for a math cram school.