Balaam is too difficult, and the difficulty of Princeton is more in line with the exam. I took the exam myself once, using Princeton, and there is no other information, 780. Sat2 itself has a high fault tolerance rate, and there are 800 points for making three or five mistakes. There is absolutely no need to study so hard. However, we should pay attention to the time, because China students spend a long time reading the questions, and it is easy to be too late, so we need to pay a little attention when practicing.