GSTR 9 and 9C Mandatory

1)if you have both firm registration on single PAN Based then your total turnover is 2crore 84 lacs and GSTR9 limit more then 2crore and Gstr-9C limit is more than 5 crore and your case is less than 5crore sale but exceed 2 crore then you have file Gstr-9 not Gstr-9c.
2) your both firm registration is different PAN then Firm A not required to file Gstr-9 and 9C and Firm B mandatory to file Gstr-9 but you have not filed Gstr-9c

Yes GSTR 9 is mandatory for both the firms

Thank you very much Deepak Sir,