"Companies only want you to put money up front to pay someone else's bills so caveat emptor"
I was reading that, and whilst possible, I thought it might be an idea to post a counter thought.
We ask, in some cases, a substantial amount of deposit for our trips. It is, unfortunately, the only way of making sure that they are committed. It is amazing the amount of 'I'm 100% definite' calls or emails that suddenly convert to 'actually, no can do' once the request for money arrives. Perhaps not so much for flying schools, but we also spend quite a bit of cash sometimes several months in advance as well.
Keeping a space that is then not taken, particularly if then others are turned away, is not an option for many companies - and particularly not flight schools who struggle at the best of times.
So, if unsure then definitely keep your money in the bank, but if the amount and timescale seem reasonable then you may have to 'take the risk'. Not trying to teach the sucking of eggs - but if 'they' seem particularly keen to get your deposit you may want to look elsewhere!
Safe flights, Sam.