@ A.J. & CSPs at forum

Sir, in how many groups ex-servicemen of Armed Forces of Pakistan may come on quota reserved for them via GHQ [according to my info 10% quota is for them in PSP, DMG, FSP].
++Is there any drawback of coming through this way with respect to promotion etc. Plus Is it possible that one didn't qualified via CSS exams may still come next year via GHQ quota allocation.
++ Is it mandatory for Officers joining on GHQ quota to also undergo some other process like final Interview (ViVa) conducted by FPSC etc. before joining CSA or they directly join CSA on joining letters issued to them from GHQ.
If you've any information in this regard, kindly share.

regards,
sincerely,