The first season of "The Simpsons" contains some episodes that simply aren't that great. In my opinion, this is one of those episodes.
The story, in brief, is this: Bart cheats on an aptitude test and is ushered into a school for gifted children. While he initially welcomes the change he soon finds that he's gotten himself in over his head.
This is the first episode in which we see Bart's underachieving ways. He wants to succeed academically but he just doesn't have the drive and the intelligence. Luckily, his parents support him either way, though Homer isn't too pleased at the end of the particular episode.
These early episodes, while sometimes lacking in entertainment value, were nevertheless essential when it came to establishing character. So, while this episode isn't necessarily that funny it makes it easier to connect with the characters later on in the series.