Hi

Basically you are a dropper as mentioned in your question.

So Any candidate who have passed class 12th from state board or CBSE or ICSE board is expected to put code 02. I t includes all students who have taken few drops

Code 01 is for 12th appearing students

Various qualifying codes are mentioned in this article, so please refer to it-

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

Best of luck