GSTR-10

Till date No notification in this regard.

Can contractor claim ITC on material purchased for the govt contract work???

No Notification has been issued yet by the Government of India regarding Form GSTR 10 ( FINAL RETURN u/s 45 ).

I just want to know that if my GST RC has cancelled in 2017 -18, so how can I file the GSTR-10 with in 3 months..?

Yes, GSTR 9 should be filed even for cancelled gst registration.

Dear @ Mohit
you are correct as per section 45 & Rule 80 of CGST Act , every person whose GSTN has be cancelled has to file GSTR 10 , within 3 months from date of cancellation , but as the council has notify the same & its also not available on portal ,. so need not worry the 3 months clause will be not effective till date

but it is available on the portal and showing the due date 15th dec 2018.
I just want to confirm that it correct or not.