Way did mr.Tullvers wish to givan his son good education?

He wants his son to have a better chance at life than he did. He is also vonvinced by others like Mr. Riley:

"You see, my dear Tulliver," Mr. Riley continued, "when you get a thoroughly educated man, like Stelling, he's at no loss to take up any branch of instruction. When a workman knows the use of his tools, he can make a door as well as a window."