How do you arrange your time? if you have trouble with your timing

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If you think you can spend you time usefully If you can find the balance point between study and life or work and life i don't know others, but in my daily life, sometimes, i feel tired with the timing ,about study , exam, friends, kinds of activities, all of them like fruits be made into salad ,but it don't dilicious like fruit salad. I want someone can give me some advice or experice about timing. Thank you very much!