Anyway, as long as parents don't doubt, they will generally agree.
Another is to seek truth from facts, but pay attention to methods. You can say that I only passed a few points in a school exam, but I don't have to take the exam for the second time. You said that I thought my exam was average and I wanted to take it again. Some other students also took part. Except for those who got particularly good grades, they generally participated. I fell behind without taking the exam and had to advance it.
This method should be based on trust in your parents, and make sure that your parents will not ask other students if they have this second interview. Also, it is more applicable if your parents don't know much about the college examination system.