Dear candidate, I don’t know about which exam/course you are talking about. However, I can give you an example about the qualification code which is used in the NEET application form. It is used to differentiate the candidates appearing on the basis of their current qualification and to know more about the candidate, how much he is qualified: Is he +2 pass in same year or dropper or graduated in any field, etc.

You will get more idea after reading this:

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

Hope, it helps!