Maybe it's because of the pressure of study. I suggest you eat nutritious food every day. For example, you can let your family buy some black sesame seeds and grind them into powder. But don't buy sesame paste packaged in the supermarket, it's fake, and if you can, put some ground Polygonum multiflorum and sesame seeds in milk, preferably at breakfast, but if you insist, it will definitely improve for a while.