Is it actually common for parents to pay their kids' tuition? In China or in the US? Everyone I know well had to pay their own way (in the US), and their grades usually suffered for it.
I have no idea about China, but in the US, unless you're going to community college, tuition is so high that either your parents are paying it or you're going into debt to pay it. If you're lucky (and "poor enough") you can get enough financial aid that the burden on your parents and your debt is minimal.