The foundation is ok, that is, those who can understand what the teacher said in freshman class should have no problem in the first round of study for 3 months. But you need to review, because you forget the front after learning, so the second round may take 2 months. This is because you can't learn, and you will feel frustrated, so two months can't be compressed. If you learn slowly and slowly in the first two times, it will take half a month to a month in the third time, so you don't need to review more in the future. Just do a set of simulation questions a week.