If you want to study medicine in International Schools or Universities situated in developing nations, you can get direct admissions by applying online to the college or through there representatives in India.
For that, you Just need good grades in 12th and NEET qualification
But if you are willing to get into Medical schools in The USA | UK | Australia | NZ| Canada or other developing nations its quite difficult and time occupying process
For the USA - you have to apply for MCAT, then for Pre Medical, then you have to start preparing for USMLE and after completing your residency you can practice as a consultant
The UK - you have to pass IELTS + UCAT | BMAT, then pass entrance interview, then you get enrolled in Medical Program after than a 2-year foundation course, then 2 years training in surgery or medicine, after that if you want to become GP you have to study for 3 more years and if you want to be a consultant you have to study for 5–8 years depending upon your specialty
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