Contact your college office for assistance. In most cases, you will want to try to first resolve the issue with the professor. The Student Advocacy Center may also be able to assist you.
Contact your Residence Hall Advisor or Hall Director.
Start with the Dennis Learning Center: http://dennislearningcenter.osu.edu/index.asp
Search on this site: http://www.osu.edu/academics/a-z.php
There are numerous ways to get involved. Check out the over 1,000 student organizations at Ohio State: http://ohiounion.osu.edu/get_involved/student_organizations.