My child is really struggling at school. He can't get on with any work. He's 9 years old. He describes his brain as having a block. However sometimes, for a really decent reward, he can get his work done. Hardly ever though. We have an appointment with the doctor at the end of the week. I am a very worried single parent. Can anyone give me any insight as to why there is a block and why he can, with a significant reward, overcome it? Thank you in advance.