At the end of season five, Bud has to write something on a professor for the yearbook. Did Bud end up in college in season five?

Betty had the same professor three years ago, but she could have been a senior in high school. Most professors are in college, so I am wondering about Bud.

Bud graduated from high school at the end of season 5. "The Gold Turnip" is one of the best FKB episodes, IMO.

In season 6 he is at Springfield College or Spfd. JC. It's clear he's starting college because in the 2nd episode of the season he is registering.

I did think the reference to "Professor" Stark was odd. I've never heard of a high school teacher referred to as or carrying the title of Professor. Maybe they just called him professor due to his years of teaching. He looked like it might have been around 50 years.