Systematic Approach to GST by S K Mishra is the most up-to-date and Comprehensive book on GST available in India as on date. https://www.amazon.in/dp/194832105X
i also read the book of ca bimal jain. It is very knowledgeable book for enhance the knowledge about GST. I recommend every people you have to need read the book if you want to get knowledge.
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For IDT, you may refer Indirect Tax Laws ( GST+Customs law) by S K Mishra, FCA.
This is the most comprehensive & up to date book on indirect Tax Laws available in India as on date.
Available on Amazon, Flipkart & Infibeam.
https://www.amazon.in/dp/164249030X