Why did huck's father want him to go to school?

Pap hates that Huck is going to school and learning how to read and write. Pap hates it because no one in his family ever could read or write and neither could Pap so he felt that his son was trying to be better than him and he wouldn't stand for it. Pap threatened Huck saying that if he ever went back to school he would beat him