The Basics of Being a Good Student

Prioritize your life: Doing well in school should be your top priority.
Study: There is no substitute.
Always attend class.
Do all of the homework and assigned reading.
Develop self-discipline.
Manage your time.

Time Management

No matter how you slice it, there are only 24 hours in a day. Good time-management requires:

Note taking on more than you can handle.
Reasonably estimating the time required to perform each of the tasks at hand.
Actually doing what needs to be done.
Only you can do these things. A couple of thoughts, though, that may help spur you on:

A minute now is as precious as a minute later. You can't put time back on the clock.
If you're not ahead of schedule, then you're behind schedule. Because, if you try to remain right on schedule, then any mishap or misjudgment will cause you to fall behind---perhaps right at the deadline, when no recovery is possible.