IIT Madras Premium Notes:

https://youtube.com/playlist?list=PL0YEn3RFcg0aYFjoOZZeviVqYNW2ML1g3

https://www.youtube.com/playlist?list=PLp85fc2kPukoVENfbVGomNYjOhbUI-Ib2

https://www.youtube.com/playlist?list=PLp85fc2kPukqins7ipq4LFhDImtKCO2qg