KAAS YouTube Channel: https://www.youtube.com/channel/UCGVdCaSiLHrK16ArrL-xw4Q

NCERT textbooks from class I - XII: https://ncert.nic.in/textbook.php

The Feynman Lectures on Physics: https://www.feynmanlectures.caltech.edu/

Free textbooks and resources: https://openstax.org/

MIT OpenCoursware: https://ocw.mit.edu/search/

IIT - JEE (Joint Entrance Examination - Main & Advanced): https://jeemain.nta.nic.in/; https://jeeadv.ac.in/ 

NEET (National Eligibilty cum Entrance Test) UG: https://neet.nta.nic.in/ 

SAT (Scholastic Assessment Test): https://satsuite.collegeboard.org/sat 

GATE (Graduate Aptitute Test in Engineering): https://gate2024.iisc.ac.in/

CSIR UGC NET (National Eligibility Test): https://csirhrdg.res.in/Home/Index/1/Home/3101/1

JAM (Joint Admission Test for Master's): https://jam.iitm.ac.in/

JEST (Joint Entrance Screening Test): https://www.jest.org.in/joint-entrance-screening-test