Hello Prakash

If you are appearing for improvement exam in all the subjects then you will have to fill the Code 01.

According to the information given for Code 01, Candidates who will take Class 12 board exam in 2019 and the results of such candidates are awaited must submit this code. However, qualifying the exam is mandatory to be eligible for admission to MBBS/BDS courses.

So, your Qualifying examination code should be 01.
Hope this helps.
Good Luck!