It's no use doing the problem blindly. Use your school experience to find his weaknesses in the paper, and then teach him what the teacher can't say, but the students are using it privately, or your own good methods.

There is also the need to be slow and repeat the key points. You think it's slow, but it's not really slow.

The focus of grade three is nothing more than quadratic function and plane geometry. As long as the functional characteristics are thoroughly understood, this is nothing.

In addition, if the student has spare capacity, it is suggested that he be taught to analyze and take derivative (not differential, of course) to facilitate calculation and use and promote understanding.