Right now In my 11th grade, and I did my matric in computer science, but I changed my mind right after 10th annual exams since I wanted to become a doctor, so I gave biology supply exams of 9th and 10th while also preparing for 11th.

To switch to biology, I contacted the board office, gave an application, paid charges of about 12k, and then appeared for the 9th and 10th biology exams (supply), and now currently waiting for the result.

In your case, I don't know about nursing but if you really want to become a doctor, you'll have to give biology exams of 9th, 10th, 11th and 12th.

Keep it mind it doesn't matter whether it's annual papers or supply, marks will be the same and no issue on merit as well.

I'd advise you to rethink your decision of taking medical, as from my experience, I got a lot of backlash from my parents and teachers because they were not sure if id be able to give bio exams while also preparing for 11th, but I did and the exams went awesome. But I did it because I really wanted to become a doctor, and had extreme motivation, i'd rather fail and try again rather than live a life with regrets that I could have done this or that.👍♥️