GST stands for Goods and Services Tax is an indirect tax reform which aims to remove tax barriers between states and create a single market. For that to happen the constitution first needs to be amended for which GST bill was introduced as The Constitution (One Hundred and First Amendment) Act 2017, following the passage of Constitution 122nd Amendment Bill. Under GST, goods and services are taxed at the following rates, 0%, 5%, 12%, 18% and 28%.
Its already live from 1st July 2017 so there is no doubt on its success.
