Don't force yourself if it doesn't matter. No one is a god. Don't make yourself too tired.
If you must concentrate on your work and study, you can try the following methods:
1. Cultivating interests, such as learning English, is a kind of pain for people who don't like it, but maybe you like watching movies, so watch the English version. In this way, I watched movies, learned English and cultivated my interest. Other situations and so on.
2. Exercise. Sometimes the spirit is not concentrated, perhaps because of illness or fatigue, and I want to concentrate but I can't concentrate. With good physical exercise and good spirit, attention is naturally easy to concentrate.
3. Adjust your eating habits. Maybe you don't like meat, maybe you are losing weight, but your physical strength can't keep up. How can you concentrate? Breakfast must be nutritious.
If conditions permit, you can do yoga meditation for a while first, and then you want to concentrate.