Hey

There are lots of books available in the market but you can download the pdf https://examdays.com/railwayrecruitment/rrb-ntpc-books-pdf-tier-1-tier-2-exams/

• Shortcuts in Reasoning (Verbal & Non-verbal) for RRB NTPC Stage II by Disha Publications
• RRB NTPC Mains General Knowledge by Knowledge Group
• RRB NTPC Mains Mathematics Formula & Shortcuts by Jagran josh
• RRB NTPC Mains English Guide by knowledge group
• RRB NTPC General Science Guide by Luminous Point