I know I'm very late to the party, but I gotta put my 2 cents in:
After school during kindergarten and 1st grade, I would watch either $20,000 Pyramid or syndicated Joker's Wild (This was when Eileen Jason had a tremendous winning streak on TJW, I still remember her name vividly for this reason).
During my 6th and 7th grade years, I remember coming home from school and watching the CBN network game show block (and thereafter watching the USA Network game show block).
While this is not after school per se, it's still worthy of mention: I remember one of the highlights of my senior year was doing my homework while watching The Challengers, that was one show I really enjoyed.