As per your query, your code should be 05. The code 05 says that, if a candidate is pursuing the three years degree course (eg. B.Sc) of a recognized University with Physics, Chemistry and Biology or Biotechnology as mandatory subjects and have qualified the first year of the course including practical tests in these subjects are required to choose this code.
It is to be noted that qualifying exam here examination must be a University Examination and the candidate should have passed the earlier qualifying examination namely 10+2 with Physics, Chemistry, Biology or Biotechnology with English at a level not less than a core course.