Jaitley said the deficit in revenue collection targets of states under the GST came down to 13 per cent till August this year compared to 16 per cent last year. Meanwhile, the GST Council on Friday decided to set up a seven-member Group of Ministers (GoM) headed by Bihar Deputy Chief Minister Sushil Modi to look into Kerala’s demand for imposing an additional cess over GST to meet the financial requirements in case of a natural calamity.