GST is integration for all indirect taxes such as excise duty, central sales tax, VAT levied by different states and custom duty. Direct tax will work as it is, there is no change in direct tax such as Income Tax Act, 1961.
the question is very wide . Please be specific about the tax law you are seeking updation. is it direct or indirect tax and that wtoo which tax under indirect tax or direct tax
As I understood, the candidate is seeking updation of Income Tax as well as GST. He / she can refer the website of Ministry of Finance for the same for easy reference.