Below are some various websites where you can find some study materials and online courses
http://www.openculture.com/
https://www.coursera.org/
http://nptel.iitm.ac.in/
http://online.stanford.edu/courses
http://ocw.mit.edu/index.htm
http://www.conted.ox.ac.uk/courses/online/
https://www.edx.org/
http://www.openculture.com/
https://www.coursera.org/
http://nptel.iitm.ac.in/
http://online.stanford.edu/courses
http://ocw.mit.edu/index.htm
http://www.conted.ox.ac.uk/courses/online/
https://www.edx.org/