Firstly, the art of studying involves repeating the subject over a longer period of time, and it is universal for all learning. However, if you read the subject with no interest to learn and with your phone beside you, you will not gain as much as you could have. It is important to predispose your study time and to use some study technique. For instance, a very popular technique is the Pomodoro. If you want to try The Pomodoro technique you study for 25 minutes, break for 5 minutes. It is important to be fully focused for the 25 minutes and take a total break from everything the 5 minutes.
I will try it later, I suggest you do the same. Adios.