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

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

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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