GSTR-1 Query

Sameer (NA) (87 Points)

25 November 2017  
My client turnover is less than 1.5 cr.
His July Gstr-1 already filed.
now Should I file Qtr-1 GSTR-1 again for Jul 17 or should I file it for aug & sep 17 only ? the due date is 31 st dec 17 for Qtr-1.