Hello Aspirant,
I hope you are doing well.
You can refer the links given below to download the pdf of nda books for free:
" >https://competition.careers360.com/articles/best-books-prepare-for-nda
https://competition.careers360.com/articles/best-books-prepare-for-nda#Best-NDA-Books-2022
https://www.careers360.com/download/ebooks
I hope this helps.
Good Luck
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