IQ is only a test of logical ability isn't it, not intelligence?
I had the highest level of logical ability in my school year along with a boy who got the same score, we were predicted all A's.
His parents kept him in all the time studying, and indeed he got A's and a B or two. I got B's and C's. We're both doing excellent degree's regardless
IQ might look good, but it doesnt really get you anywhere if it isn't nurtured.