AIIMS is considered as one of India's best medical colleges. It has many different courses in various subjects.
The DM course is a three-year degree which can be done for super- speciality after doing an MD or BMS course. Their fees are Rs. 6,875 total at Rs. 2,375 for the first year and Rs. 2,250 for each of the next years.
MD is a two-year doctorate course that can be done after MBBS. Its fees are the same as those for DM.
M.Ch. is the highest Masters degree in the field of medicine. It is completed over a period of 3 years. At AIIMS, you can do this course at the same fees as the previous two.
Hope I have been helpful and good luck!