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Answer
Hi Saleem,
There are a few books in the market, but many of them are compilations of old papers. It is better to prepare from online resources. Do check out Cracku's tests and products at the following links:
https://cracku.in/railways/rrb-2016-mocks
https://cracku.in/railways/rrb-previous-papers
https://cracku.in/railways/pricing
