First of all, I think we should pay attention to diet and regularity. It is easy to indulge yourself after school, and the diet is often irregular, which is very unfavorable for maintaining weight.
Second, if you have enough perseverance, keep exercising every day. Morning running is not advocated here. Do some exercise in the evening, maybe jogging. If you are bored, you can find a partner.
Third, pay attention to rest. Many people say that staying up late can lose weight. I want to say that it is not only bad for your health, but also bad for losing weight.