Hello and welcome

DD5 took the WPPSI-IV in October and hit 3 ceilings, 2 of which were used in the composite scores. My understanding- it's possible the GAI/FSIQ can be artificially depressed b/c of these ceilings however there's no guarantee. It may be they'd get the very next question wrong, in which case the score is legit. Or they could continue answering correctly forever and ever.
Good luck w/ the DYS process! We are just now setting up our BB profiles after applying. The application is much more intimidating than it probably should be if you have the scores so don't stress too much about it.