The first example You open the book, sit down and read at least 1-2 pages. Then close and then review what is in your head? If you think that you have read and you understand you will come out, but if you don't understand, try to go back and read it again and then ask yourself whether there is anything distract you are whether you open music. There are other noises. You find a calm and focused, I love music with a closed course.
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