If you've got time on your hands then do not fret!
What ever you do, do not dare think that you know better than the interview staff!!
Take it on the chin and go back, maybe with a bit more humility(!) A wild guess but OTCs, UASs are not the ideal training grounds for future Officers. They may work for some but may give others a false sense of their own ability/authority/position.
Ignore the fact that the people interviewing you probably have not seen an aircraft for many years but have the company policy scripted on their lap whilst reeling off those questions.
You've done the right thing, shown willingness/motivation and look forward to your return.
Do not be downhearted. Keep us all updated.