Oh, beware of HUGE fish TINY pond to medium fish HUGE pond if child is really all that then he will at some point be in a bigger pond; at undergrad? postgrad? faculty? there will be places he is challenged, and it is useful to know that is coming. I know planning way ahead. DO NOT spend the next 15 years stressing to child how SMART he is as some sort of innate thing. Find other things to challenge, maybe in different ways (music? art?) celebrate the ways your child's peers are also amazing individuals with unique talents. Do not be my parents trying to turn me into an arrogant jerk (I ran into the huge pond, and came out with a decent life, but hoo boy have I seen failure modes)

Oh and when the kid is bigger a computer is a MUST, with internet access. Independent learning is the way to go when school is dull.