in November month I have gst tax liability is of rs 3,00,000 but I have fund of rs 1,50,000 only and my liability for the month of Dec is of rs 1,40,000. so is it possible to file gstr 3b of Dec first?
Nope, As GSTR-3B is a summary return in which we have to provide details of all the supplies, eligible ITC, self declared tax payable or ITC to be carried forward etc. Some of these details are auto populated in the next month return like input tax credit. That's why you can't skip one month GSTR-3B.