Here is the list of some of the various Specialization Fields available for MBBS Students in India

The major Specializations include:
General Medicine.
Ophthalmology
General Surgery.
Orthopedics
Pediatrics
ENT (Ear, Nose and Throat).
Obstetrics & Gynecology
Psychiatry.
Dermatology
Anesthesiology.

There are also 'Super Specializations' which require a further 3-5 years of study in areas such as:

Plastic Surgery.
Paediatric Surgery
Neurosurgery
Gastroenterology
Cardio-thoracic surgery
Endocrinology
Conito-urinary surgery
Clinical Hematology