Like many people have said, you do need to study smarter.
Different methods work for different people, and you should mix and match to achieve a combination that you like:
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Reading the book ; Pro: Can do anywhere, any time, can cross-reference with notes ; Con: Boring, book is heavy
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Reading lecture notes ; Pro: Can do anywhere, any time, can annotate without feeling guilty ; Con: Material organized according to your professor's mind, which sometimes isn't sane and sometimes notes don't contain all you need to know for exams
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Writing your own notes ; Pro: Writing is a good way to reinforce the material concepts, and you can make it colorful and re-read it according to how you want ; Con: If you learn a wrong concept or misinterpret something, it is committed to paper and there's nobody around to correct you
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Going to lecture ; Pro: Words go into your ears ; Con: Long, contain unnecessary filler times, can induce sleepiness
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Computers and quizbanks ; Pro: Can do in your room or at the library ; Con: Eye strain, computer material often either too basic or too extreme compared to books
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Group discussions ; Pro: Maybe there's a smart teacher-type student or tutor who can help you, and you can also discuss/teach other people to test yourself ; Con: Need to interact with actual humans, time constraints and transportation time cost
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Going to lab ; Pro: You get to look at real cells and dissect real cadavers, and there could be helpful tutors around ; Con: Unless you already know the material somewhat, lab isn't a good place to learn without guidance
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Osmosis ; Pro: The book goes into your head ; Con: Can't happen in real life