If you fail in the college entrance examination, I think it is normal for you to repeat one year. If you repeat two years, I think you are a very brave person, because not many people can repeat one year on the basis of repeating one year. However, I don't think it is necessary to repeat studies for many years in order to be admitted to a prestigious school.
Nineteen or twenty years old is our most precious period. It's normal to repeat a year or two. But if it is repeated for many years, it will be meaningless.
Even if you are not admitted to the prestigious school in your heart, as long as you enter the university campus, you will find that there are still many opportunities for you. You can study hard, get various scholarships, take the postgraduate entrance examination, go to the prestigious school you want, participate in various competitions, improve your ability, or enjoy a beautiful university life in college.
However, if you are bent on going to a prestigious school, you will not get these opportunities and a better life.
In fact, in the eyes of most people, it is not worthwhile to repeat studies for a famous school for many years. Such precious youth, there is no need to do these things.