<p>I TA at my school, but that involves helping out in lab, grading problem sets (according to a rubric, and the prof checks them over to make sure she agrees with the way partial credit was given before she puts the grades in her grade book), running review sessions and help sessions for tests and problem sets, and being someone the students can email or find at midnight if they need a question answered. </p>
<p>The TAs I had my freshman year helped me get through a very difficult year without going crazy, and helping other freshman is the best way I can think of to give back for the awesome TAs I had.</p>