What is there in CMT that cannot be learnt by self-study? An option would be to apply to the institute directly and get the study-material. This will save you a few lack rupees.
Re. money back guarantee, have you read all the fine print?
And finally, trading is learnt as much by experience as by studying theory and evolving one to fit it to one's psyche. Just as taking lessons from Lewis Hamilton or Nico Rosberg cannot make one a F1 level driver, so too taking lessons in technical analysis cannot make one a successful trader.
I may be wrong, but just giving my view as you are looking for answers. Good luck in your quest.