looks like ur questions is some how similar as those they asked me pretty much the same, and they asked me couple questions of basic aviation and training in fta as well.
for your question about sending them an email,
they wouldnt really tell you why.
cuz someone tried and this was the reply he got at the time:
Thank you for your interest in the Cadet Pilot Programme.
It is understandable that you asked for feedback to further improve yourself. However, we are unable to give a review of reasons to unsuccessful applicants. We trust that you can have an accurate assessment of yourself as to what you can improve in the future. Thank you for your attention.