How to manage your time between school and your part-time job?

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I am a student now. And my parents do not give me enough money for studying in my university. So I must do part-time job to solve this problems by myself. It is really a boring job and it takes me a lot of time (4 hours/ day and 5 days/ week).Sometimes, it makes me very tired. But searching a job it not easy. So I can not leave it.Therefore, it is really a big problem to me. please, teach me how to do?