Videos by Teachers are crap. Repetitive Bad quality and not even arranged in order.
You can find excellent videos freely in youtube from many other education institutions.
You expect Meritnation to be perfect, but there are few mistakes. Like for acceleration due to gravity you should consider+ve or -ve, That is mixed up. So you can try Meritnation due to its design. I purchased the AIPMT crash course. It is ok.
Can you forgive Meritnation for even few mistakes?
Not at all.