Thank you for your well-considered post. I find it interesting that you would recommend significantly higher scores for a 6th grader than for an 8th grader. In a way, I would have thought otherwise. There would be no pressure for DS, who is a 5th grader, to score highly on the AMC10 whereas if he were to take it as an 8th grader, he would probably feel embarass if he perfomred poorly.