How. To gain my focus on important stuff and how to understand what I'm reading

I find it easier to focus when I'm well rested and to understand what I'm reading I underline big words and important things

For me I love gaming but at the same time I have homework. So it is hard for me and I'm going through it right now but improving me. You must first think which one is important. Like is gaming important over homework or homework importance over gaming? You might choose the second one, why? It is really simple, you must first think about it. Homework that is due the net day must be done and today is the only day to do it. Gaming, you can play after homework since it is not due the next day, it is not gonna effect your life and future. And to understand what you are reading is to metaphor. To imagine the scene out on your mind. Make gist every paragraph you read and as questions.