Urgent - gst tax on contract work

I am doing Government Contract Work and the total value of the work is Rs.765800/- and the Work Period is 3 Months taken the work in Oct 2018 and in December 2018 i have received a cheque of Rs, 584600/- Department Recovered 2% of GST and paid in GST and it reflects on the returns i want to know my total turnover of this year is below Rs.10,00,000/- Only, while filing GSTR - 3B of December i want to pay the tax @ 12% of the total amount of cheque received Rs.584600/- or i can show Cheque amount as exempted turnover Rs. 584600/- (the total turnover of the year is below 800000/- only ) and claim the TDS in cash ledger