If you have a minimum aggregate of 50% in each of physics, chemistry and biology and you are right with  basics and follow appropriate guidance and esteemed institution is like Aakash or Allen or even take up the MBBS preparation course available in the careers360 platform
You also have to understand that taking ideas of appropriate books like HC Verma and Arihant in physics, Dinesh and Pradeep along with op Agarwal in chemistry and Truman in biology will make your concepts very profound and solid and if you make organised structure notes from these books of the relevant chapters are mentioned below then it should be very helpful to you for regular revisions and developing concepts especially  in tabular format with pictorial representations and revise them regularly
Mehndi you have to pay heed to the important chapters of thermodynamics, mechanism of modern physics and wave optics in physics, chemical energetics and kinetics in physical chemistry, hydrocarbons and carbonyl compounds in organic chemistry organic balancing inorganic chemistry and photosynthesis in botany, animal kingdom in zoology, Human Physiology chapters of cardiovascular, respiratory and nervous system as well as the chapters on biomolecules in the life cycles of plasmodium in microbiology and other relevant chapters of biotechnology on which many patients are being asked nowadays
the long and short of it is that you will have to be active in solving as many MCQs is you can on a daily basis and give time on MCQ examinations to improve your question selection and time management skills

Dear Soumyadeep,

If you are planning to join medical then you can start it right after your 10th as your preparation of medical can be run parallel with your 10+2 or with Class 11  and class 12 preparation as some part of the syllabus is coincide with the NEET UG irrespective of whichever boards you belong to.
But if you have done your 10+2 then I suggest you to start reading the basic books like NCERT it may not take enough time because you have a basic concept and then move forward to a standard book of every subject like Physics, Chemistry, and Biology. Do follow the previous year's papers of NEET you will be familiar with the question pattern and decide that which part is your strongest and weakest and where to focus more.

I hope this will give you an insight into what you are asking.

Good luck.

If you are interested in  doing Medical studies  then go for it. Choose the career as per your interest, knowledge and which gives you maximum satisfaction with great future scope.

For details about medical examinations , you can take help from the below mentioned link:-

https://medicine.careers360.com/articles/9-medical-entrance-exams/amp

Good Luck

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