Treating MH Dept Psychiatrists/Psychologists PHD, private or VMC, specialize in establishing a rap ore with their patient. Their interviews are non adversarial in nature, very difficult to successfully treat a MH Patient that you've pi$$ed off.
The PTSD C & P should be considered as an Adversarial PTSD Interview, which will make or break your Claim. The C & P Dr is tasked with verifying the veracity of your reported PTSD Symptoms. These Drs are not concerned with treating your MH Conditions, just verifying their actual existence and to what degree, they are disabling.
If the C & P Dr concludes your over-reporting symptoms or that other answers to specific questions (sometimes asked 2 or 3 different ways) doesn't comport with accepted PTSD DXing standards, a negative DBQ will be completed.
Wouldn't hurt to review the PTSD DBQ and Current VA Clinician Best Practises for completing the Rating Dept Requested DBQ.
All the best to you and your family!!
Do you know if you were granted P&T along with the IU?
Be sure and check out all of your state benefits!!
Again, Congratulations on your new rating and your upcoming Graduation!!