Take any opportunity you can to teach while you’re in graduate school. It’s an excellent experience. It looks great on the resume, and it will build your speaking/leadership skills. And, at the very least, you’ll get funny stories out of it. So far, I’ve had a student who said he was so stressed out that he’s going bald, a student who asked me for help reading her bank statement, and a student who admitted he Googled me and found out I was French. Teaching is full of surprises.