How is the standard of teaching in coching centres of Dehradun

For which course is this? Can you elaborate? If it is for JEE, a lot depends upon the students also. Coaching centres are just a tool to prepare. The actual study and hard work has to be done by you. If you think you need coaching, check the infrastructure - size of class room, faculty details and ask other students studying there about the feed back. Also check their study material as it will give you a good impression. Hope this helps. All the best