If he done the questionnaire correctly, it will ask him for the correct fee amount. If he don't pay enough fee because he lied in the questionnaire, his application is very likely to get rejected outright and waste all the waiting just to do it again, what's the point? Wanna gamble your 30 days of time on the officer's mood? be my guest.thejkhan said:Don't make things utterly complicated.
As long as he submitted the application to extend status (IMM 5710) he's fine.
Just wait till request for the extra fees or application to be returned.