2, mainly because my original college allows it, and some colleges rank equally, and 10% majors have opportunities. Some colleges, such as the environmental engineering major of Jianhuan College at that time, required a grade point of 3. You can transfer, it's a little abnormal, and your grades are too good to transfer. But as long as the original college signs it, it will generally be no problem. Generally speaking, the GPA is required to be above 3.0.
3. Freshmen and sophomores can change their major. Usually in April and May, they should pay more attention to this kind of news on the website of the Academic Affairs Office of Sichuan University. Some majors may require a grade, such as the School of Mathematics.