I cannot figure my 8yo son out. Trying to memorize multiplication tables and we are getting nowhere. He's frustrated and I am frustrated. He understands the concept of multiplication. What really confuses me are his WISC scores. On the quantitative reasoning subtest on the WISC V...he scored in the 97th percentile (91 math 98 figure weights). All other areas he scored in the 99.9-99th. Shouldn't he excel in math facts?

He scored average in wmi and low in processing speed... according to his psychologist this may have been due to boredom, disinterest and exhaustion. Due to this behavior and some avoidance she provisionally diagnosed him with anxiety and possible ADHD. Could this be the cause of his difficulty? How can I help him with memorization? Any advice would be greatly appreciated.