Relatively speaking, there is still a lot of free time. Go out to play more after class, and you will lose weight if you exercise more.
Have baked sweet potato (steamed sweet potato) and a bad milk for breakfast.
If you want to lose more weight, you can also eat a sweet potato for dinner.
Please help yourself to lunch. Avoid red meat such as beef, and eat some fiber-rich fruits or biscuits for dinner, but you won't lose weight in a day or two. Like what? Jia Jinhong's relaxed diary? At least a few months ~ ~