Online Tests for IIT

1. https://www.embibe.com/engineering/test/jee-main
2. https://mypat.in/

Books for IIT Mains and Advance

https://www.careers360.com/question-books-to-crack-jee-exam

https://magoosh.com/jee/best-books-jee-main/

Class XI: All Subjects (Link1, Link2)
http://www.examfear.com/free-video-lesson/Class-11.htm

Video Lectures:
Class XI: PHY (link1, )

NCERT exemplar (Main, )

NCERT Solution for class-11 Maths with audio (Link1 )