If you belong to Karnataka, your code will be 03. Code 03 says: The Intermediate/Pre-degree Examination in Science of an Indian University/Board or other recognised examining body with Physics, Chemistry, Biology /Biotechnology (which shall include practical test in these subjects) and also English as a compulsory subject.

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A candidate who have 10+2 from CBSE/ICSE or any other state board examination with Biology/Bio-technology, Physics, Chemistry or Mathematics or any other optinal subject must use code 2.A candidate who have passed qualifying exam in the year 2018 but wish to appear for NEET UG 2020 shall also use code 2.So you need to use code 2 while filling the application form.