Summer school, that is, use your spare time during the summer vacation to attend classes, and then transfer back to school with credits. The advantage is to take credits in advance and graduate early. At that time, I wanted to finish college within the visa time, so I used this time to study credits when I returned to China. At that time, I went to Sichuan University in the name of the lion summer school newspaper, and finally got the credits and transferred them back to the school, which reduced the pressure on the school to study credits.