Hey,
CBSE verification takes about a month or two at the least. But since you need to get it done ASAP, you'll have to start hassling the CBSE, I doubt the DGCA can be of much help.
If you've forwarded the papers through the flying club, the verified marksheets will be mailed to the club directly from CBSE. Try and see if your flying club has any contacts, at least you might come to know who to hassle.
MKS