I Am Graduate Student And I Want To Persuate Higher

I am graduate student and i want to persuate higher education.so i hace take a gap of 1 year so i can prepare for exam.But i could not study.I waste my time everyday doing nothing and then i regret it most.I dont have any motivation,I feel lazy all the time.I became so moody.I know that i have to study but at next movement I forget about goal and start using phone all day.please help me from my situation...In advance Thank you.