Hi aspirant

You code would be 02 that is:

The higher/senior secondary examination or Indian School Certificate Examination (ISCE) which is equivalent to Class 12 examination after a period of 12 years of study. The last two years of such study comprising of science subjects such as Physics, Chemistry, Biology/Biotechnology and Mathematics or any other elective subjects with English as a core subject as prescribed by the National Council of Education Research and Training (NCERT) after introduction of 10+2+3 educational structure as recommended by National Committee on Education. This code will be applicable for those candidates who have qualified Class 12 in the year 2018 or before and have not pursued any other course after the completion of Class 12.

You can check NEET eligibility : https://medicine.careers360.com/articles/neet-eligibility-criteria

All the best.