@karamyog, this is a cool hunt. I love these educational resources where people can learn right away from the experts with video and audio instructions, and also exercises for the students to do. This kind of learning is perfect as you can learn anytime at your convenience and also at the students' most optimal time to learn and to absorb new material because it depends on the students' time. Must give this a try as the teachers are the experts of their subjects. Great hunt.