My parents are not well-off, so stingy.

Hehe, don't put so much pressure on yourself, the reality already exists, and the most important thing is mentality. You just have to do your job well and try to get into a good university. You have your ideals, and your parents have their ideas. It doesn't conflict at all. When they reach middle age, they naturally have no initiative. And you are still young, and everything is still early. You must keep a relaxed attitude to face life and study. Don't think about buying a house and getting married in the future. The most important thing now is to get into a good university and realize your dreams. You don't have to cram, but you must buy books. Of course, the premise is to understand the existing teaching materials and counseling books.