I know that there's a 1 year minimum between testing times for each of the WPPSI and the WISC, but does this apply as well to the last time a child took the WPPSI vs. taking the WISC? Context: DS took the WPPSI as a 5yo in Feb 2021, but we want the WISC for a more complete picture now that he's 6 - do we have to wait till Feb 2022 or is it ok to take the WISC already?