Your question is really interesting to answer. You’ve mentioned that you’re in 12th grade. And you’ve made a choice to go for a medical profession. But you’ve not joined any institute yet. I could not understand one thing that how would you do that? I mean to say if you’ve chosen a study plan but you did not choose any institute yet then in this case how would you understand the subjects which are related to that field? Probably you’ve thought that you can read them from books. But what do you do about the practical experience of those subjects. You need to take some coaching in some good institute for becoming a doctor. And you also need to make a foundation for your future study.
That is not possible without having early practical study in different subjects. Like you need to know some basic about operations and you must also perform them by your hand to completely understand how an operation works. For instance, if you’re studying biology, you must perform an operation of the frog in early stages to become the doctor later on. It is the rule of practical subjects.
You cannot study only from books. You do need some teachers and instructors. And you must select an institute for study.