Discuss your grades with your professors. Many students don't understand why they received a certain score on an assignment or test. Schedule a meeting with your professors during their office hours and ask how to improve next time. Also, bring up any concerns about grading you might have; professors do make mistakes that cost students valuable points.
Ask your professors for extra credit assignments. Writing an extra paper or completing an extra assignment can help you boost your grades quickly before the end of the term.
Take classes in proper study technique. Although extra assignments and grade adjustments will help, you still need to do well on all of your projects in order to get your GPA up. A well-designed course in proper study habits and technique will have the cumulative effect of helping you perform better in all your classes at once, offering a powerful boost to your GPA.
Drop a class, if possible. Sometimes, you cannot drop a class due to scholarship credit hour requirements. However, if you have the option of dropping a class when worried about your GPA, it is an option worth looking into. If you drop your hardest class before the deadline, you can spend extra time working to bring up the grades in your other classes. Then, take the dropped class again during a summer session.
Attend class regularly. Missing class puts you behind in the subject matter that will be covered on exams and in assignments, as well as important information such as reviews for quizzes. A perfect attendance rate will definitely help raise your GPA.