Best Books for preparation of SSC and UPSC

For full (Physics+Chemistry+Biology) in summary:

• General Science by Nitin Grewal (McGraw Hill Education)
• Amazon (Rs 250)
• McGaw Hill (Rs 225)
• The Book Shop (Rs 188)

To build your overall GK:

• General Knowledge by Manohar Pandey (Arihant Publishers)
• सामान्य अध्ययन by मनोहर पाण्डे years SSC questions:

• Maths Solved Papers by Kiran Prakashan
• English Solved Papers by Kiran Prakashan
• General Awareness by Kiran Prakashan

Physics For Scientific Assistant:

• Pradeep's Objective Physics (This link is for NEET level. You do not need JEE level for it.)

For UPSC conducted exams:

• Pathfinder for CDSE by Arihant Publishers
• Pathfinder for NDA by Arihant Publishers

For Civil Services (by UPSC and State PCS)

• Physical and Human Geography by Goh Chen Leong
• Comprehensive Geography by Mahesh Kumar Barnwal
• समग्र भूगोल by महेश कुमार बरनवाल
• Our Constitution by Subhash Kashyap
• हमारा संविधान by सुभाष कश्यप
• Indian Polity by Laxmikanth
• भारत की राजव्यवस्था by लक्ष्मीकान्त (MHE Publishers)