Why does Huck want to go to school now?

From the text:

At first I hated the school, but by and by I got so I could stand it. Whenever I got uncommon tired I played hookey, and the hiding I got next day done me good and cheered me up. So the longer I went to school the easier it got to be. I was getting sort of used to the widow’s ways, too, and they warn’t so raspy on me.