Happy to introduce Hyperbook for GATE
http://getbook.co/gate contains around 150 useful websites related to GATE preparation. It will be useful for those taking mockup / real exam and need to revise things quickly. It is a careful compilation of useful links posted so far in this group.
Hyperbook (http://getbook.co) is a software to share notes and interesting websites among members in a group. If you like to share your notes or add more websites to the collection , please do contact me. arvindiisc at gmail