Most colleges look at other things besides grades. For instance, if your grades were better your senior year the college may grant admission. Or they may consider the difficulty of the courses or the number of courses you have taken. You can locate study aids at the library or bookstore. You can find lists of books or CDs to help boost your SAT or ACT scores on the Internet.
Some colleges let students enroll conditionally, allowing the student to take the test later.
Check with the college you plan to attend. If a college profile indicates a school has rolling admissions, this means the school does not have a specific deadline. For example, Ivy Tech State College will accept students as late as the Saturday before classes start. If you are applying late for fall or spring semester, check the college profiles for schools with rolling admissions. If paying for college is a concern, talk to the financial aid officer at the college you plan to attend.