senioritis

noun

1. (Canada, US, slang, uncountable)A tendency of seniors in high school or college to skip class or slack off due to a desire to move on, or because they have already been accepted by a college and their further academic performance is no longer as relevant.

   “I don't know, but "senioritis" is real, as I discovered in my senior year. Senioritis is a frame of mind particular to high-school seniors.”

   “And right now she has a raging case of senioritis. […] Whether you call it senioritis or senior slump, there's no disguising the collective sigh of relief […]”

   “I worked hard my senior year, something that was particularly difficult due to the senioritis that many others were feeling. But it paid off!”