Put your phone AWAY or if you need it in case, put it on do not disturb. Have water with you. Don’t study for 2hrs+ without a break. Make sure your workspace is clear!
You need a place where you can focus good on your work and make sure nobody will interrupt you. Than you should stay away from your phone. Maybe you could set a timer how long you want to study. Good Luck!
Put your gadget away from you if u don't use it to help u studying. Turn off your notifications, so u will be more focus. U could listen to some music if it helps you when you're studying.