BBC Earth has many episodes which can help you improve your listening skills and also provide you with excellent exposure to new words. History channel also offers an excellent documentary. I often advise my students to watch them and then ask them a few questions from the episodes to confirm their comprehension and fluency in replying. Hope my advice helps you too, Rajashekar.

Dear Raja, 
Thanks for your question. To answer your query, I would like to say that you cannot attain an advanced level in English only by watching YouTube channel. However, its always best to start somewhere. Below are my suggestions:
1) BBC Network - Asia and World
2) Writetotop channel
3) Shashi Tharoor conferences videos
4) Unacademy 
5) Pep Talk India - For Grammar
And lastly, listen to TED Talks.
 
All the best! 
 

Hello Raja,

Good question.  It is good to hear that you want to upgrade your English skills to intermediate.  There are 5 YouTube channels that I came across. Here they are:

1.  English with Lucy.   

2.  Learn English with Emma.  

3.  BBC Learning English

4.  MMM English

5.  Learn English with Papa Teach me

https://www.youtube.com/watch?v=R8yHHWT5RXk

I found all this information at this above YouTube site.  I hope this helps you.  As a native English speaker, this a good goal to strive for.  English is such an universally accepted laguage.  It is good to have a good understanding and command of the English language.  

Take it easy and happy learning,

Sheila

Hello Raja, continue the practice to be an active observer and read useful articles. As you wish to go advanced, you need to develop an environment where correct English floats. Context is essential to trigger yourself to speak the right words and frame sentences. Check with Converse E+. They have a coach who is very popular but didn't come out for self advertisements.
Good luck.