I guess your'e in Australia? Or South Africa? It may be that a lot of the knowledge stuff was popular culture - things he may pick up at day are etc or off TV. It also may be that he wouldn't answer some questions because he was only 90% sure not 100%. Unless you wanted him to do something that required an IQ over 130 then 127 is not really an issue. Honestly it is a pretty optimal IQ. If you don't need the score wait until you do then retest.