Hello there.  I can understand your concern.  Dont put so much of stress on him. Its not good to memorize.. Children should learn and not memorize. We should teach them to think and not tell them what to think. There is a difference. Let him learn at his own pace. When he learns, he will go a long way forward in his life. Momorizing wont get him anywhere. Be patient with him. Best regards. Dr. Anil kumar jain. Bangalore.