I think you need to wait until you know his scores on the individual indices. That will give you a lot more information about what is going on.
If his achievement is good, I would tend to suspect that somehow the IQ test is not measuring the kind of intelligence he has. There may be a reason for that, and knowing the reason may be useful.
On the other hand, the whole thing could just be a fluke, and nothing has actually changed with him at all. I know two weeks is a long time to wait with these worries on your mind! ((hugs)) But try not to jump to conclusions. You just don't have enough information yet.
