Digital Infrastructure for Knowledge Sharing (DIKSHA): DIKSHA, an MHRD initiative
https://diksha.gov.in.
Content for grades 6 to 10: DIKSHA
https://diksha.gov.in/cbse/
Creative and Critical Thinking (CCT) questions:
https://diksha.gov.in/resources/play/collection/
Text Book Question Bank:  for students of class X
http://cbseacademic.nic.in/revision10.html
E-Pathshala: NCERT has uploaded 1886 audio files, 2000 videos, 696 eBooks- 1st to 12th
http://epathshala.nic.in  
http://epathshala.gov.in
National Repository of Open Educational Resources (NROER): NROER has a total of 14527 files including 401 collections, 2779 documents, 1345 interactive content pieces, 1664 audio files, 2586 images and 6153
http://nroer.gov.in/welcome
SWAYAM: SWAYAM is a national online education platform that hosts 1900 courses covering school education (grades IX-XII)
https://swayam.gov.in.
Major subjects of Secondary and Senior Secondary level developed by NIOS are also available on
https://swayam.gov.in/nc_details/NIOS
   SWAYAM PRABHA: SWAYAM Prabha has 32 DTH TV channels transmitting educational content 24/7.
https://swayamprabha.gov.in.
DTH Channel no 27 (Panini)
www.swayamprabha.gov.in/index.php/channel_profile/profile/28
YOUTUBE CHANNELS:  NIOS and CBSE also run YouTube channels for secondary and senior secondary level subjects:
https://www.youtube.com/channel/UC1we0IrHSKyC7f30wE50_hQ/videos
For classes 11 and 12 NIOS content can be viewed on: https://www.youtube.com/channel/UC6R9rI1iEsPCPmvzlunKDg/videos
For class 12 Physics, Chemistry and Mathematics, CBSE content can be viewed on: https://www.youtube.com/channel/UCG7qv69PhtZlwDzB2vTWzKQ/videos
NATIONAL DIGITAL LIBRARY OF INDIA: The National Digital Library of India is an integration platform for schools, colleges, universities, teachers, students——-
https://ndl.iitkgp.ac.in/
IIT Pal: Students who are interested in getting online coaching for IIT entrance exams can access lectures on Physics, Chemistry, Mathematical and Biology on the official website of National Testing Agency at the link: 
https://nta.ac.in/LecturesContent Â