how can i manage my time?

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i am a 3rd year college student taking up pharmacy. this semester, i have lots of hard subjects that require serious studying. there are lots of reports, quizzes, exams, etc. but to my surprise, the mother of my bestfriend told me that i'll be one of her coutilion de honor in her debut. so that will need practice. secondly, our band will also play there. again, still need to practice. and lastly, i'll be having a solo piano that day. huhuhu. how can i manage my time?