Keep in mind that your grades, along with your GMAT score, are what an admissions officer uses to predict how successful you will be in an MBA classroom.
Check not only your overall GPA, but also check your grades in quantitative courses like calculus, accounting, and statistics. If your overall GPA and course-specific grades match up with or exceed the average GPA of your target schools, then move on to your GMAT plan.
If your grades are average or fall below the average GPA of your target school, you need to create a plan to "repair" your transcript. Many applicants are not aware of the fact that you can re-take necessary coursework to enhance admissions prospects and preparation for success in an MBA classroom. MBA applicants can enroll in courses at a local junior college. This secondary transcript receives consideration along with your undergraduate transcript; it only benefits you if the course grade proves your competence. Said simply, you need to earn an "A" in these additional courses. A top grade is a must if you are applying to one of the more competitive MBA programs.
If you never took calculus or accounting, you should consider taking these additional courses prior to applying to business school.