i don't know what should i choose between medical and engineering because I'm interested in both. But there may be some condition applied, i want decent and good lifestyle, a decent income,a good car (BMW, Audi) and travel around the world. so what should i choose now?

Dear Pritam, you haven't mentioned your highest qualification. You haven't mentioned whether your strength lies in solving mathematical problems or dissecting earthworms. You need to decide on this because that is the first step in deciding whether you will become an engineer or a doctor. You might be interested in both Engineering and Medical streams but you might not be scoring good in Biology and skilled as you are in Mathematics. Then it serves no purpose in studying Medicine because that will take you no where. All the conditions that you have for yourself are pretty good. But you need to ask yourself if you are really ready to put in all the hardwork to achieve these goals. If you do not, the conditions will remain dreams. You do not select a career by putting forth some conditions. If every Engineer or a Doctor was earning this good, Indian roads would only have BMWs and the houses would be only palaces and castles. No profession guarantees you your dreams. You should work hard for them and even harder when the bucket list is high profile. So you should select a stream that will retain your interest for the next 20-40 years. Because once you fulfil these wishes, you will have to work harder to retain them.

Hello,
.
Both the mentioned fields are well developed and has a good reputation.
.
Both the fields can earn enough which allows you to buy a luxury car but only once you are an experienced person and an expert.
.
Now, there are such things which should be considered like,
educational interest
educational grades
educational performance
Experience etc.,
.
So, these are the things that matters to provide you high packages
.
Now,if you possess all the skills in both the Fields. Here are few things which you should know,
.
If you are going for engineering field,
you should get an experience for high packages. And once you are a field expert,.then there are chances for receiving a whole monthly income in a single Day.
.
If you are going for medical field, it will take couple of years to be a rich man and must be cooperative to fulfill your dream. A single month income is not worthy for your dreams.
.
So, not it's upon you. I have cleared with a fact what actually happens in both the field, how they work and the logic behind the scene.
.
NOTE: A beginner in the job itself doesn't bring you money.It takes couple of years in Both the fields. Must be cooperative and hardworking.