Naive question.
What does BA mean by three schools or fewer?
There must be a lot of candidates who have:
PPL at a flying club.
ATPL Theory at BGS or CAPT GS.
HB at a school in the US.
CPL/IR at a well-known ATO.
MCC at a different ATO.
So five schools in total. Surely they can't reject them as it's a pretty standard path.