Tom Sawyer dislikes pretty much everything about school that has anything to do with learning. He likes chasing after girls, and he likes fighting with the boys. But other than that, it is not much fun.
He does not like to have to sit still in the school room when it is nice outside. He does not like having to listen to the teacher when he could be playing with a bug on his slate. He really does not like much of anything. Basically, Tom wants to be free, he wants to do things like going fishing and swimming. School prevents him from doing this.
tom does not like school because to him it is like a prison and it is not much fun. he thinks school is just something adults use to take away some of the playing time of children.