When I was preparing for my entrance exams, at that time this channel was started. Whiteboard lectures from Dr. Neela Bakore are great for understanding the concepts. You can make this your only source if you are preparing for Indian medical entrance. On her website, she has added few test papers also to help students. And the best part is that all of this material is for free. The Hyperlink will take you to her website. Here is the link for his youtube channel.