An interesting premise with really stretching common sense though. The fact Miss Crump immediately didn't notify Andy of the mistake is almost fireable. Helen said Opie could get all "A's'" with hard work which contradicts her grade ceiling for Opie in future episodes being
a lot lower. Andy was also a blockhead thinking a "C" student could get all "A's" magically. Good thing Opie's made of tough stock. Only 3 funny scenes are Barney's reciting of the Preamble, "very. Democratic of you", and the beginning Barney's multiple interrupting Opie's adding numbers. Weak epilougue. Would have been a complete dud without Don Knotts.