Whenever I want to study, I think about stopping playing with my mobile phone after 10 minutes of playing, but I always procrastinate, and then I play with my mobile phone until I go to sleep, without the energy to complete the task of the day, and then postpone it until the next day... 
Simply uninstall the game you used to play and delete your game play account so even though you play next time you will start from the beginning which means you will lose the interest 9 out of 10 times for sure.