Andy's usually a welcome helper to Opie in his studies. However, Andy's not much help with arithmetic and he has never been much of a speller. He's probably pretty good in biology, though he did flunk grasshopper dissection once.
History is the subject that Andy helps Opie with the most. In fact, he even helps Opie and his pals start a history troop, called the Mayberry Minutemen. That impressed Miss Crump, and the rest is, well, history.