Today, students are finding it difficult to focus on their studies not because they don't know the importance of education, but because they are being distracted by a lot of things. Three things are needed if you truly want to focus on your studies, and they are; commitment, consistency, and motivation. These three factors are needed to compliment your efforts in your studies.
There are other things you still need to be doing. Initially, you need to set a timetable for yourself. Students attend different classes per day; setting an appropriate timetable will help you with your reading. It is advisable not to be using more than an hour on a subject so that you won't get bored easily. Spend little time on other things. You shouldn't spend the whole day reading; in fact, this will make you get tired easily. Attend to other things; play with friends, sleep if you want. After this period, go back to your book and remind yourself about the things you have read earlier. Once you notice a level of progress, you need to reward yourself as this is going to serve as your motivation.