Brave I think she is asking for pay rates not fees for studying.
OP - different centres have different pay scales, as some pay above award wage whereas some simply pay award wages. Though $14.50 sounds low I am pretty sure I was getting around $16 while studying for my Cert III and once I completed it my pay went up to $19 (obviously casual would be more)
As LA mentioned casual may be significantly more pay but there is no guarantee of the amount of hours you may work / week.
And yep the pay is shocking and you can earn more at the checkout at Coles, but that is just how it is at the moment, hopefully our worth will be realised and wages go up!
I know I work in the industry because I love it, money is secondary to me, as long as I can pay my mortgage & bills & get my groceries I am ok.