My sister is docter there and she studied also in AIIMS, for students you know this is best place to be and thats the reason that they conduct seprate exam for it.However from a patient point of view it is cheaper but crowded as well, if you know someone in AIIMS than its okay , you dont have to go here and there , if not than you to sweat to get your work done.
Reports also take too much time, but emergency service is really good, in fact you should try to admit there first as you will get treatment readly.Hope it helps. : -)