Everyone in school get these letters, in the end they will want $25 to put you in THEIR magazine, $75 to buy the book they put you in and then $50 to go to a banquet where you realize you are then only who showed up and it isnt even close to the McDonalds parking lot.
Seriously though, when I was a senior... I got kind of the same letter (I had a 2.9, granted I was in Calc, Phys, and Buisness Drafting) for academics ( called Whos who in America ) and I turned it down. Then later I got one for football (hadnt played in school since I was a Soph) then I got one for Wrestling before Wrestling even started!!!!
See a pattern here?