2. Never, ever reveal any past or present medical conditions you may have. You are Superman when you go for you medical, nothing less. I suspect that the audiogram is probably at lower end of the spectrum when it comes to what the CAAC doctors are looking for.
That is really poor advice. It makes the doctor's job of carrying out a risk assessment nearly impossible. If they know they are being consistently deceived, they are far more likely to require additional testing, etc in order to make an informed decision. In most authorities the applicant makes a legally enforceable declaration regarding the information that they do (or don't) supply, and if found to be less than truthful can lead to cancellation of licence or prosecution.
Cheers,
BM