Then try another method. Correct a problem and give a little reward. That's how I teach my children. For example, if he does 12 correctly, he will put up a sticker with a big five-pointed star and draw two small five-pointed stars. Then every time you modify a question, draw him a small five-pointed star, and then stick a sticker with a big five-pointed star after the modification. Tell him that the 10 post of the five-pointed star will satisfy his little wish, take him out to play and so on.

Hehe, I wonder if it applies to your son.