It has been said that whoever is in charge of the cadet program is not exclusively in charge of it, and has a million other things to do. It's also been mentioned that whomever has already been invited to attend the first stage, will be contacted again for further details. In my opinion, contacting etihad at this point wouldn't do anything but harm to your application since patience is highly expected in these kinds of process.
All what's left to do now is wait and practice long division... no calculators allowed.