GST rate amendment revises Assam tax schedules for fly ash bricks, building bricks, and roofing tiles from a retrospective date. Amends the Assam GST rate notification by omitting specified entries from Schedule I at the 2.5% rate and inserting new entries in Schedule II at the 6% rate. The added goods include fly ash bricks or fly ash aggregate with 90 per cent or more fly ash content, fly ash blocks, bricks of fossil meals or similar siliceous earths, building bricks, and earthen or roofing tiles, with effect from 1 April 2022.