Have we considered not even attempting Skinnerian behavioral modification on children? The feedback already exists in the outcomes of the child's actions, for

Have we considered not even attempting Skinnerian behavioral modification on children? The feedback already exists in the outcomes of the child's actions, for example, their grades in school. Why do we need to add additional praise or blame on top of the existing feedback? The scores are what they are, and the child can react to them as they are, interpret them at face value. Of course children can be guided and/or pushed to improve their performance, but that involves advice and instruction, not praise and blame. If you want to help a child to do better at, say, math, isn't it better to do some math with them rather than doling out praise or blame and then sending them off to their room with no other effort from the parent? How about demonstrating to them that effort leads to improvement?