Hey

 For becoming a doctor first of all you should have science with biology as a subject in 11th and 12th. After that you have to clear the National Eligibility cum Entrance Test(NEET UG) for entrance into the MBBS(Bachelor in Medicine and Bachelor in Surgery) couse. If you got a good rank in it, you would be selected in a government medical college or otherwise you have to opt for a private medical college. MBBS course is of 4.5 yrs. + 1yr internship(compulsory). After completing your MBBS, you can do PG(specialization- MD or MS) in any subject which is of 3 yrs. duration. After that, you can also do super specialization in your respective subject.

hello aspirant,
well as if you are studying class11th, you better start your preparation for NEET, for better results.
after 12th, you can appear for NEET and clear your NEET exam and get a score lf atleast above 400 and to get eligibility to various doctor fields like BAMS,BHMS,BDS ,MBBS.
go through below link for more information
https://www.google.com/amp/s/medicine.careers360.com/articles/medical-courses-after-12th/amp
hope you understood,
thank you