As far as the exam, you'll probably meet with an audiologist and he/she may give you a hearing test, the air blow test, and a speech discrimination test. They will also ask questions about what you did in the military. Tell them about being around the jet engines and fuel trucks. Also if you can look up VA Fast Letter 10-35 and see if your MOS has a high probability for tinnitus. They are suppose to concede tinnitus if you are a high probability MOS I believe. Also if you havent already done so, bring your private docs records/notes, they may or may not look at those.If your already being treated for the tinnitus it should help as long as you can prove the service connection. I have no idea about the sleep apnea C&P though, and hope others will chime in. Don't be nervous and good luck!