Before you return to school, you'll need to get any problems that led to your suspension under control. If you were suspended for drug use, for example, you might need to go to rehab. If depression caused you to miss or fail classes, you should seek treatment before you try again. Your school may also place conditions on your readmission, so carefully read your suspension documents to ensure that you've met these conditions before you seek readmission.
School policies vary regarding suspensions. At most schools, you don't have to reapply for admission. Instead, you need to petition the school to lift the suspension after a predetermined period of time has passed. You may have to enter a probation program if you're accepted back to school. For example, Richland College in Dallas, Texas offers a suspension-to-probation program. Previously suspended students get additional academic help during their probation period. You'll have to meet all deadlines for petitioning to lift the suspension, and you may have to document that you've met specific requirements established by your school.
If your school won't let you back in or you're not sure you want to go back to your original school, you can still stay on track with your education. Try applying to a community college to get your grades up and slowly readjust to college life. After a semester or two, you can reapply to your old school or try to transfer to a new school.
After you get back into school, you may have to do some work to bring your grades up, particularly if you were suspended for academic reasons or received an academic penalty as part of your suspension. Some schools allow students to repeat courses and replace failing grades with higher grades, and this can greatly improve your GPA. If this isn't an option at your school, try taking electives that interest you or classes that you know will be easy as you transition back to school. This can boost your grades and make the transition back to college life smoother.