Hello there!

First of all if you are addicted to smart phone and games then first thing first you need to remove the gaming apps apps from your home screen and disable all the notifications from the gaming apps , you can even uninstall gaming apps simply and can switch from virtual games to playing real games like cricket and football etc which are beneficial for you and also refreshes one's mind so you will be able to concentrate on your studies better . Coming to your mobile addiction,  you can simply avoid using it , just don't keep your mobile with yourself,  your can give it to your  mom and ask her to give it to you only when you go out from home or when someone calls you or if possible you can switch to simple keypad mobiles to remove your addiction .

thankyou