For full (Physics+Chemistry+Biology) in summary:
For UPSC conducted exams:
- 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)