I think that is possible, provided you have to work some extra midnights to clear Class 12th Board Exams with Biology as a subject. Do consult your School Administration, as I think its never late until your Registration is Complete for Board Exams.

You need to study the Biology topics and prerequisites from the previous year as well as other Science Subjects in Class 12th to get a satisfactorily Percentage in Class 12th.

Now coming to the MBBS Part. Frankly speaking, clearing NEET to get a Seat in Government Medical College isnt that easy. Aspirants even prepare to spend three to four years in Preparation. My suggestion to you would be if you really have determination to Crack NEET, plan to drop a year post Class XIIth. Suppose your XIIth year is 2022, hence by that time you will get cleared of all your concepts as well as Basic NCERT Knowledge.

Investing another year in capitalizing your Knowledge gained, taking a proper guided preparation under a good coaching institute or distance learning programs, coupled with test series and Rank Booster Booster Packages might just work your Way and help you in achieving your dream of becoming a Doctor.

Basically cracking NEET or JEE, is more of a strategical journey, driven by determination and focus. Think wisely and All the Best.

Hello dear student

I think it is fully depends on you ask yourself is it really your interest in biology and want to be a doctor than yes good decision and you can do it. But the subject shifting are different for every board so you can do it accordingly.

Hope that's helpful

Best of luck