If you failed OAT's test for co-ordination in their recent selection and have a PPL (H) I suggest that on the day the standard required was set slightly above your current ability.
This level could have been set for the company requirements which may have been higher than for general selection.
Surely the de-briefer gave you an insight on where you went wrong and how to improve.
The level required for a PPL is not the same as those required for an ATPL on a sponsored scheme.