Hi, It sounds like your child might have ADHD as his slow learning could be due to the result of poor concentration. Do not be worried about his IQ because as you described, he is able to solve blocks puzzles. Often children with this issue find it very easy to focus on television or activities which they find interesting. Even when it comes to subjectives they will be selective hence, they would be slow in the ones which they find it boring. Symptoms of ADHD are poor concentrations and attention span, easily bored, incomplete work, bad hand writing, impulsive, nail biting and behavioral issues liked stubbornness. There are many articles on the internet on this topic. I would suggest you to consult a child psychiatrist/ child psychologist for specific treatment. This is absolutely curable.