On the one hand, you can use the summer vacation to relax yourself, enjoy life and do something you like and are interested in. For example, you can travel, see different landscapes and cultures, and broaden your horizons and mind. You can also read books and read some classics or novels to enrich your knowledge and thoughts. You can also exercise, exercise your body and will, and keep healthy and energetic. In short, after the college entrance examination, let yourself have a good rest and prepare for the coming college life.
On the other hand, you can also use the summer vacation to improve yourself, learn some useful skills and knowledge, and increase your competitiveness and attractiveness. For example, you can learn to drive and get a driver's license, so it is more convenient for you to travel and make friends in college. You can also learn English, improve your listening, speaking, reading and writing skills, and lay the foundation for CET-4 and CET-6 or studying abroad. You can also do some part-time jobs or internships, experience social life and working environment, and earn some pocket money or experience. In short, you should make continuous progress and growth during the summer vacation, laying the foundation for future development.
The above are my suggestions and references for what high school students should do in the summer vacation after graduation.