Hi

You had failed in 12th in 2020 , so you have appeared as a private candidate in 2021 and your result is awaited. So,

You need to choose the code 1.

This is because ,

code   1 is for 12th board 2021 ( doesn't matter whether it's regular or private candidate) appearing students or have already appeared for 12th board 2021 examination but results are awaited i. e results are not declared yet.

Here's a short brief of Neet codes :-

--------) Code 1 :- code 1 is for class 12th board 2021  examination appearing students with physics, chemistry, biology and English or have have already appeared but results are awaited i. e have not been declared.

--------) Code 2 :- code 2 is for all those who have passed their 10+2/higher /senior secondary/ Indian School Certificate Examination with physics, chemistry, biology and English

--------) Code 3 :- code 3 says it is for those passed their intermediate / pre- degree examination  with physics, chemistry, biology and English ,your physics, chemistry and biology should also contain practical exam.

--------) Code 4 :- pre - medical degree with Physics, chemistry and biology.

--------) Code 5 :- code 5 is for all those who are doing graduation  and have all the three of Physics, chemistry and biology in their graduation.

--------) Code 6 :- code 6 is for all those students who have passed  BSc  with at least any two of following subjects :-

>>>>Physics,

>>>>chemistry ,

>>>>biology

--------) Code 7 :- code 7 is for those who have passed their examination from foreign board which is equivalent of Indian 10+2 board.

For more visit

https://medicine.careers360.com/articles/neet-qualification-codes

Thank you