This is a quote from Qatar Airways' website.
Thank you for considering Qatar Airways for your future career - due to Qatar Airways' popularity we are receiving too many applications for the positions available. Whilst we would like to reply to each and every application, please accept and understand that only candidates who are successful in being called forward for interview will be contacted. Please do not jeopardise your application by submitting it frequently.
I don't know if this will help you or not.
Regards,
MTQatar