1) Kumar Sir’s e books for IIT exams ( Mathematics)
https://drive.google.com/file/d/0B7EuL-4ojOaKc0R0NDlhamFadnc/edit?usp=sharing
https://drive.google.com/file/d/0B7EuL-4ojOaKc0R0NDlhamFadnc/edit?usp=sharing
2) Previous IIT papers from 2005 to 2013 with hints & solutions
https://drive.google.com/file/d/0B7EuL-4ojOaKQ2NvMUI4UFRlaXM/edit?usp=sharing