ECAM This....
There are no tricks, I feel you f**cked up your SIM ride as per the SIM Instructor, so based on his report they will never call you again.
More over Qatar Air is getting few chaps from SIA through teir advisor. If you know MdV ex SIA guy than its fine may be you have some chance otherwise forget it baby,,,,,,,,better luck some where else......after all Doha is not the last place on earth to work.