• Quantitative Aptitude for Competitive Examination by RS Aggarwal, S. Chand Publication (Must for beginner)
• Fast Track Objective Arithmetic by Rajesh Verma
• Data Interpretation by Arun Sharma (TMH Publication) Highly Recommended
• Quantum Cat by Sarvesh Kumar Verma
• NCERT Maths from Grade 6 to Grade 11
• Quantitative Aptitude for Competitive Examination Paperback by Abhijit Guha
• Magical Book on Quicker Maths by M Tyra (Highly suggested)
• How To Become A Human Calculator by Aditi Singhal ( Must for those who wants to improve calculation speed.

Online Sources

• Indiabix for beginners
• Affairscloud.com Highly recommended
• Smartkeeda.com
• Abhinay Sharma youtube videos
• Daily quizzes of Adda247, Oliveboard etc
• Follow free Youtube lecture of any good coaching for practice

• A Modern Approach to Verbal & Non-Verbal Reasoning by R.S. Aggarwal for beginners
• A New Approach to Reasoning Verbal and Non-Verbal by B.S. Sijwali and Indu Sijwali
• Analytical Reasoning by MK Pandey (Highly Recommended)
• Wiley’s Reasoning ability and Quantitative Aptitude
• How to Prepare for Logical Reasoning by Arun Sharma
• Logical and Analytical Reasoning by A.K. Gupta

Online Sources

• Indiabix for beginners
• Affairscloud.com Highly recommended
• Smartkeeda.com
• Daily quizzes of Adda247, Oliveboard etc
• Follow free Youtube lecture of any good coaching for practice

• Lucent’s General Knowledge by Vinay Karna , Manwendra Mukul , Sanjeev Kumar , Renu Sinha , R. P. Suman ( For preparation of static part) 
• NCERT Books of Class X, XII- History, Geography, Economics

Online Sources

• Daily quizzes of Adda247, Oliveboard etc
• Follow Daily free Youtube lecture of any good coaching
• Monthly and daily capsules of Adda247, Anuj jindal or any good coaching for preparation current affairs
• Read daily news

• Word Power Made Easy by Norman Lewis (Good for building up vocabulary)
• Newspaper- The Hindu, The Economics times, Business Standard, Indian Express for beginners
• Objective General English by SP Bakshi
• Quick Learning Objective General English by RS Agarwal
• Better English by Norman Lewis
• High School English Grammar and Composition by Wren and Martin
• From Plinth to Paramount by Neetu Singh
• A Mirror of Common Errors by Dr Ashok Kumar Singh

Online Sources

• Indiabix for beginners
• Affairscloud.com Highly recommended
• Smartkeeda.com
• Daily quizzes of Adda247, Oliveboard etc
• Follow free Youtube lecture of any good coaching for practice
• Follow Daily The Hindu Editorial analysis on Youtube of any good coaching

• Bharti Bhawan Modern Hindi Grammar
• RBD Hindi Gramer Language
• Garuda Hindi Grammar Based On NCERT Books 6 to 12 By Santosh Purohit
• NCERT Grammer