Teddy's father is a prominent physician who puts a great deal of pressure on the boy to achieve at a very high level. As an only child, Teddy felt that all his father wanted from him was that he do well in school. He thought that the only time there was affection in their relationship was when he got a great report card. He stated unhappily, "He never has any time for me ─ except to check if and how I did my homework. I just want him to love me." I advised the father as follows: "Give him the quality time he needs from you.
"Teddy felt that all his father wanted from him was that he [do] well in school."
"He" is a singular noun and therefore requires a singular verb "does", so why did this author use the plural verb "do" after "he"?