It all lead me the remnicent of SAT time when i was a highschool kid, no phone, no digital things, focusing time can up to 4hours which now is only one hour. i think its great idea to turn wifi off on our pc and put phone in other room to be much more focus and prolong our hours complete for study, nothing else in our mind. One important thing is no maudlin music, a lot of cold wind when we feel sluggish sunshine eye stimulate will be great to stay us alert.