Not much, although only about 20 people are recruited every year, there are very few people who report, and there is basically no pressure. As long as you get about 330 points, you can basically get in. Specialized courses are not too difficult, such as semiconductor physics and module electricity. The main thing is not to behave badly in the second interview. If you are not a major in this field, it is not good for the teacher to ask you questions without knowing it. By the way, I majored in microelectronics at University of Science and Technology Beijing.