Go to class. Get there on time. Sit up front and wear your glasses if you need them. Remain alert, don't eat huge meals before class, bring water with you and get adequate rest the night before.
Get to know your professor. Take advantage of her office hours. Discuss classroom topics to get additional perspective. Ask for help with any concepts with which you're struggling. Ask what will be covered on upcoming exams and find out test formats.
Take notes. Write down the main idea of each class lesson and supporting points. Care more about getting all the information than getting it down neatly. Review your notes before the next class and copy them over if necessary.
Study sane. Set aside time each evening to review your notes and your texts. Take additional notes on what you read. Use a highlighter to accent the main ideas. Post important definitions and facts around your study space, as well as in places you'll look often, like your refrigerator door or bathroom mirror. Don't cram the night before exams. You might remember the information long enough to pass your test, but you won't retain it for the long haul.
Compare notes. Form study groups with peers to whom a high GPA is also important. Discuss class concepts and upcoming tests. Review notes together and help one another fill in the missing pieces.
Ask for help. Don't be ashamed to get a tutor if you need one.
Turn in your work, completed and on time. Make sure your work is "A" quality before you hand it in. If you aren't sure, ask a professor, adviser, mentor or trusted peer for a second opinion. Ask early enough so that you can revise your work if necessary.
Hang out with your friends. Be a well-rounded person. Pursue extracurricular activities and attend social gatherings. Remember that everything has its place. If you make room for fun, you'll be ready to focus on work when it's time.