hello dhivya..

medical field is a vast area of field with many courses and colleges .

here are some courses in medical field with good opportunity.

Human Anatomy

This is the basic subject that one studies in Medicine. It deals with discipline of anatomy divided into macroscopic and microscopic anatomy of human body.

Biochemistry

This branch of Medicine deals with chemical process that takes place within human body. Thereafter, it focuses to understand the impact of chemical processes on human organs.

Orthopaedics

This specialisation emphasises on injuries and diseases of your body's musculoskeletal system. An MBBS aspirant can later choose to pursue MD in this domain.

Radiotherapy

The focus area of this subject is to impart knowledge about x-rays, gamma rays, electron beams or protons to curtail the malice such as cancer cells in human body.

Ophthalmology

In this subject you will study about anatomy of Eye and how it functions. The subject digs deep into various diseases of eyes and how they can be treated.

Anaesthesiology

To find out about total or partial loss of sensation with or without the loss of consciousness, anaesthesiology is the subject which you should read carefully.

Human Physiology

Be it mechanical, physical, bioelectrical, or biochemical functions, human physiology focuses on understanding their impact on humans.
There are many more subjects that are taught to medicine graduates, the ones enlisted above are a few among many sub-specialisations. A student who pursues higher studies i.e. M.D. can specialise in any of these niche.

hope this information helps you ...

all the best....