You really need to work on your math @
imurcane
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He clarified below . . .
But if he were a HS senior now he would be class of 2017. If he were a HS junior he would be class of 2018 . . . all the way to 2021. However, if he were a freshman in college on the 4 year plan he would be class of 2020.
I have never in my life heard the expression the OP put together. As a frosh in HS or college we would say we were the class of . . . as a senior in HS Id say Im the class of 2017.
But hey congrats to the OP.