Dear Student,

There is no such best channel on youtube especially for MP Board. But I suggest you to search for chapter-wise explaination or if it is not available try searching topic-wise.

Search the topic or the chapter name on youtube and grab a good explaination video and go with it. This technique will be very beneficial and also by this, you will be able to learn your syllabus as well the depth of knowledge required for your exam. This way you can use youtube as a good source to study in the right way required for your exams and also for the news regarding MP Board exams, I would recommend you to go for the channel "Boards Education".

Happy Learning!