Here's a good compilation of *Study Materials for the Civil Services Examination*.
1. Environment - Shankar IAS Academy
2. Science and Technology - TMH Publication
3. Indian Economy - Key Concepts - Shankarganesh
4. Indian Polity - Laxmikant
5. Indian Economy - Ramesh Singh
6. Geography - G C Leong
7. Lucent - General Knowledge
https://drive.google.com/file/d/0BxkQmyYIKVgAUWxzSUJLOTdGdEE/view?usp=sharing
8. IndiaN Foreign Policy - Rajiv Sikri
https://drive.google.com/file/d/0BxkQmyYIKVgAV3A0U09IMThZUzQ/view?usp=sharing
9. Spectrum - Art and Culture
https://drive.google.com/file/d/0B-7pRR2ueeZTSXpUamFwaUFKbms/view?usp=sharing
10. History - Spectrum
https://drive.google.com/file/d/0BxkQmyYIKVgATjRod2lFVjNzT3c/view?usp=sharing
11. India Since Independence - Bipan Chandra
https://drive.google.com/file/d/0BxkQmyYIKVgAb2JwNnRZWGozV00/view?usp=sharing
12. India's Struggle for Independence
https://drive.google.com/file/d/0BxkQmyYIKVgAVU52RDhZWlVzQ1U/view?usp=sharing
UPSC Mains Material:
Complete Material Links for UPSC 2017
Indian Art, Culture & Literature
https://drive.google.com/open?id=0B09kMr7btph8flphQ1BTU2NHUnNBbExVZnpOdFBwQnlwRTJfdDJfLTlCMVZpcTYzTzNEMUk
History
https://drive.google.com/open?id=0B09kMr7btph8fktNR0tqTXN3eFJsUUxmcG9LVzlUZnhudHhHNERQQTNLc1NVb2lzbHNTR1U
Sociology
https://drive.google.com/open?id=0B09kMr7btph8fmFwN1FUR2xXM1VGNkw5N0JwVnlFdVVYNTVFYnIxbVVIMWMtdEIxU1czNjQ
Geography
https://drive.google.com/open?id=0B09kMr7btph8fkhNTU1SSGdpQU1ub2VBVHh3S2VicnhjUUp6anpNY1VudDI5MUpUSWpVNUE
Political science & IR
https://drive.google.com/open?id=0B09kMr7btph8fmVZU0VwUnZ5amFrdXdsWjRMQzBWMWRinglbm9hdjR0SlpweHV1NGFIN0kzVms
Economy
https://drive.google.com/open?id=0B09kMr7btph8fi02MTB5U0Q2NWhJLVo2ZVcwS0xEcElXLWpYeFBNOGNKOUVKNE9mSy1WX1U
Science & Technology
Environment & Biodiversity
Disasters & disaster management
Ethics, Integrity & Aptitude
SRIRAM’s IAS Notes
VISION IAS Current Affairs
YOJANA Magazines
KURUKSHETRA Magazines
Sci & Tech Current Affairs
VISION IAS Test Series & Toppers Answer Booklets
Essay Writing
https://drive.google.com/open?id=0B09kMr7btph8fkd6ckZjTjBoUkFJZlpycnpObkEyZUwxYkdiZ1E1U2J6dnJKV3dzMXUyNDg
CSAT
https://drive.google.com/open?id=0B09kMr7btph8NVY5VV9BV1JBZnc
Public Administration Optional
https://drive.google.com/open?id=0B09kMr7btph8fk11MXFVSEs4cE90ZUlJdmQ0NXZBY3hPU1Y2MEFveXpac0F0UndGVDh3U3M
Psychology Optional
https://drive.google.com/open?id=0B09kMr7btph8fklDTFA4QktWVllIYkg4LVBwZzlldWJrWVhIelhIdzl2MG1uYktWblBabHc
Philosophy Optional
https://drive.google.com/open?id=0B09kMr7btph8fnFpYU9RcGN1cXpkWVlLbUpoN1IySkUySUJKN2Y4N3pyODFheFhVckhhQnM
Medical Science Optional
https://drive.google.com/open?id=0B09kMr7btph8fnZEaWtRdmhMakR0UG9DSzFUVlBZN1ltamQ2cDl4SzJzb3FVbEhlZmpVb3M
Compulsory UPSC Mains Languages
https://drive.google.com/openn?id=0B09kMr7btph8flVEM3JNR1hLenNaT1JXaHZ0R2FmbnhuYVBMNWZrSmZZZTcxblZHYWpld3M
UPSC Mains Syllabus- orderly arrangement
https://drive.google.com/open?id=0B09kMr7btph8T3ZOQ0lORWZBSEk
UPSC Mains Question KEYWORDS
https://drive.google.com/open?id=0B09kMr7btph8SHRGVXU3LWJOTXM
PRELIMS Q Papers
https://drive.google.com/open?id=0B09kMr7btph8aFB6ZDVjUWdTMEk
Maths Optional material 5 links
Maths plus additional mostly schaum series
1. https://www.dropbox.com/sh/oh4qdbgc76fxvb5/AACkFnn8NOWcBYH7S6Mt8i7Ia?n=91700194&oref=e
2.https://www.dropbox.com/sh/nzyql7n367ytana/AAC6VCk3ogqmr7VwBabBoxO7a?n=91700194&oref=e
3. https://www.dropbox.com/s/n47ogug7mr3b4fo/theoritcalfluidsbook.pdf?n=91700194&oref=e
4. shorturl.at/hBLVX
5. https://drive.google.com/open?id=0B-7pRR2ueeZTLWtrQUlma3pKVTQ
1. Environment - Shankar IAS Academy
2. Science and Technology - TMH Publication
3. Indian Economy - Key Concepts - Shankarganesh
4. Indian Polity - Laxmikant
5. Indian Economy - Ramesh Singh
6. Geography - G C Leong
7. Lucent - General Knowledge
https://drive.google.com/file/d/0BxkQmyYIKVgAUWxzSUJLOTdGdEE/view?usp=sharing
8. IndiaN Foreign Policy - Rajiv Sikri
https://drive.google.com/file/d/0BxkQmyYIKVgAV3A0U09IMThZUzQ/view?usp=sharing
9. Spectrum - Art and Culture
https://drive.google.com/file/d/0B-7pRR2ueeZTSXpUamFwaUFKbms/view?usp=sharing
10. History - Spectrum
https://drive.google.com/file/d/0BxkQmyYIKVgATjRod2lFVjNzT3c/view?usp=sharing
11. India Since Independence - Bipan Chandra
https://drive.google.com/file/d/0BxkQmyYIKVgAb2JwNnRZWGozV00/view?usp=sharing
12. India's Struggle for Independence
https://drive.google.com/file/d/0BxkQmyYIKVgAVU52RDhZWlVzQ1U/view?usp=sharing
UPSC Mains Material:
Complete Material Links for UPSC 2017
Indian Art, Culture & Literature
https://drive.google.com/open?id=0B09kMr7btph8flphQ1BTU2NHUnNBbExVZnpOdFBwQnlwRTJfdDJfLTlCMVZpcTYzTzNEMUk
History
https://drive.google.com/open?id=0B09kMr7btph8fktNR0tqTXN3eFJsUUxmcG9LVzlUZnhudHhHNERQQTNLc1NVb2lzbHNTR1U
Sociology
https://drive.google.com/open?id=0B09kMr7btph8fmFwN1FUR2xXM1VGNkw5N0JwVnlFdVVYNTVFYnIxbVVIMWMtdEIxU1czNjQ
Geography
https://drive.google.com/open?id=0B09kMr7btph8fkhNTU1SSGdpQU1ub2VBVHh3S2VicnhjUUp6anpNY1VudDI5MUpUSWpVNUE
Political science & IR
https://drive.google.com/open?id=0B09kMr7btph8fmVZU0VwUnZ5amFrdXdsWjRMQzBWMWRinglbm9hdjR0SlpweHV1NGFIN0kzVms
Economy
https://drive.google.com/open?id=0B09kMr7btph8fi02MTB5U0Q2NWhJLVo2ZVcwS0xEcElXLWpYeFBNOGNKOUVKNE9mSy1WX1U
Science & Technology
Environment & Biodiversity
Disasters & disaster management
Ethics, Integrity & Aptitude
SRIRAM’s IAS Notes
VISION IAS Current Affairs
YOJANA Magazines
KURUKSHETRA Magazines
Sci & Tech Current Affairs
VISION IAS Test Series & Toppers Answer Booklets
Essay Writing
https://drive.google.com/open?id=0B09kMr7btph8fkd6ckZjTjBoUkFJZlpycnpObkEyZUwxYkdiZ1E1U2J6dnJKV3dzMXUyNDg
CSAT
https://drive.google.com/open?id=0B09kMr7btph8NVY5VV9BV1JBZnc
Public Administration Optional
https://drive.google.com/open?id=0B09kMr7btph8fk11MXFVSEs4cE90ZUlJdmQ0NXZBY3hPU1Y2MEFveXpac0F0UndGVDh3U3M
Psychology Optional
https://drive.google.com/open?id=0B09kMr7btph8fklDTFA4QktWVllIYkg4LVBwZzlldWJrWVhIelhIdzl2MG1uYktWblBabHc
Philosophy Optional
https://drive.google.com/open?id=0B09kMr7btph8fnFpYU9RcGN1cXpkWVlLbUpoN1IySkUySUJKN2Y4N3pyODFheFhVckhhQnM
Medical Science Optional
https://drive.google.com/open?id=0B09kMr7btph8fnZEaWtRdmhMakR0UG9DSzFUVlBZN1ltamQ2cDl4SzJzb3FVbEhlZmpVb3M
Compulsory UPSC Mains Languages
https://drive.google.com/openn?id=0B09kMr7btph8flVEM3JNR1hLenNaT1JXaHZ0R2FmbnhuYVBMNWZrSmZZZTcxblZHYWpld3M
UPSC Mains Syllabus- orderly arrangement
https://drive.google.com/open?id=0B09kMr7btph8T3ZOQ0lORWZBSEk
UPSC Mains Question KEYWORDS
https://drive.google.com/open?id=0B09kMr7btph8SHRGVXU3LWJOTXM
PRELIMS Q Papers
https://drive.google.com/open?id=0B09kMr7btph8aFB6ZDVjUWdTMEk
Maths Optional material 5 links
Maths plus additional mostly schaum series
1. https://www.dropbox.com/sh/oh4qdbgc76fxvb5/AACkFnn8NOWcBYH7S6Mt8i7Ia?n=91700194&oref=e
2.https://www.dropbox.com/sh/nzyql7n367ytana/AAC6VCk3ogqmr7VwBabBoxO7a?n=91700194&oref=e
3. https://www.dropbox.com/s/n47ogug7mr3b4fo/theoritcalfluidsbook.pdf?n=91700194&oref=e
4. shorturl.at/hBLVX
5. https://drive.google.com/open?id=0B-7pRR2ueeZTLWtrQUlma3pKVTQ