Hello sir

Please find the link that provides you a detailed guideline of GATE Civil preparation along with the list if books that would be required during the presentation 

https://www.google.co.in/amp/s/engineering.careers360.com/articles/what-are-best-books-for-gate-civil-engineering/amp. 

Along with this you can also visit this website that provides the list of top 10 books for your exam. Make sure to give a quick read before you buy any book to see whether it would a easy read for you or not. 

https://testbook.com/blog/books-for-gate-civil-engineering-pdf/amp/