Hi shanu, 

Any you tube channel cannot be predicted by us that they are right or wrong.  if you are getting knowledge from that channel then get it but be sure that they are teaching each and everything that is in syllabus in a correct manner. And the thing matter is you are understanding  it or not. 

For any other information you can ask us. 

Hello,
Cracking JEE requires conceptual clarity and problem solving.
UN Academy videos, though helpfull, are not sufficient themselves to cover JEE syllabus as deeply as asked in the exam. It is recommended to go though standard books such as NCERT and than use these videos to revise and bring clarity to your learning.
Practicing previous hear questions is also very important.
For more JEE preparation related queries follow the link:
https://www.google.com/amp/s/engineering.careers360.com/articles/how-prepare-for-jee-main/amp
Good luck

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