Dear Aspirant

The minimum age should be 17 years at the time of admission or will be completing that age on or before 31st December of the year of your admission to the 1st year MBBS/BDS Course so it would be not be a problem.

And in year 2020, even if your result will be awaited for 12th boards, you may apply for NEET 2020 or any other medical exam but you will have to pass the 12th with the required pass percentage of marks at the time of first round of Counselling.

Hope this helps you.