Hii aspirant,

See in the recent times many institutions and platforms have started giving online courses to students for the jee main preparation and it is quite in demand. As you have asked about the free resources I would suggest you to go with the following teachers who have provided free resources on YouTube.

Physics - Namo Kaul and Alakh Pandey

Chemistry- Anupam Gupta and Arvind Arora

Mathematics- Sameer Sir and Neha Agarwal

Also to excell in the examination only studying is not sufficient so, you are recommended to use our jee main preparation booster package at https://learn.careers360.com/jee-main-rank-booster/

Hope it helps!!