"English as a Second Language" was written by Tim Hobert, and directed by Gail Mancuso. It aired on May 13th, 2010.
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When Senor Chang reveals that he doesn’t have any actual credentials as a Spanish teacher to Jeff, Annie finds out and reports him. She’s worried that the gang will break up after Spanish class is over, and figures that if Chang isn’t a real teacher, their grades will be invalid and they’ll have to retake the class.

Greendale just hires a new, much tougher Spanish teacher, and everyone worries they won’t be able to pass the final. After a studying marathon, everyone passes, and they agree to take a different class together next semester, so that the study group won't be broken up.