Yes, absolutely possible.
BTT results are PERMANENT. Once you pass it, you will NEVER have
to take it again.
FTT is slightly different. If you took FTT with BBDC, and you
quit BBDC, results will still stick with you because BTT and FTT
results are kept by TP. BBDC or any other schools have nothing to
do with the BTT and FTT. But FTT's results don't last forever like
BTT. I think FTT's results is only valid for a year or two. So you
must pass everything before you previous FTT's results is void and
nullified.
But seriously, who took longer than a year or 2 to pass their
Driving test?? Unless you are ridiciously busy or something..