Hello student you can check yourself which is good youtube channel for preparation as there are many YouTube channels which are providing free educational videos but you need to analyse yourself which one is good and understandable.
You can also subscribe to careers360 knockout package for preparing and qualifying the entrance examination. It offer you 100 percent money back guarantee if you do not qualify.
Refer to the link mentioned below -https://www.google.com/url?sa=t&source=web&rct=j&url=https://learn.careers360.com/knockout-jee-main-april/&ved=2ahUKEwjAnbjv1LLpAhVLbSsKHemiBQwQFnoECAMQAA&usg=AOvVaw3XS9X1Sxkryg5E8liFJ_4C

Feel free to comment if you have any doubt
Good luck

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