Thanks, everyone.

My son is in a gifted class as well, and the scores will often be accompanied by the class average. When DS gets 100% the class average is 85%. When he first started I warned him that he will likely not be the best in the class anymore (after being at an ordinary public school hitherto), and he didn't put much effort in and was getting A-s, now he puts in a little effort and gets As and A+s. He is happy and enjoys school, which I think is because he's realised with minimal effort he gets great scores. But then I wonder if that's a good thing and maybe things will always be that easy if he's that smart.