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If you have any doubt about an assignment, ask. Go see tutors if you must and do all your work.
Show up for every lecture.
Sit close so you can hear/see well.
Why? Simple: College is optional education. The teachers are not required to try to teach everyone. Because of this, a large number of professors only show as much interest in a particular student's education as that student does. They are not hoinh to try and force you to learn. Instead, they give you the opportunity and resources to learn. Past that, it is up to you. So if you are there, well positioned, and asking questions, then you can get good grades. Oh, and most professors notice effort. You can get extra credit for trying becuase profs see so few people that do.