Ratings agency Standard and Poor's has said, the passage of the indirect tax law GST, gives it additional conviction of India clocking 8 per cent growth in the next few years. <br/><br/>In a report today, it said the passage of the GST is arguably the most important structural reform to date by the Narendra Modi government. <br/><br/>The ratings agency said GST will improve efficiency, cross-state trade and tax buoyancy.