I am a chemistry honours student and in second of bsc my first year include physics and chemistry with Aecc . I have passed class 12th with PCBM with english and computer science. So my question is which code should I choose while filling form for Neet ?

Your code will be 05. Code 05 says: The first year of the three years degree course of a recognised University with Physics, Chemistry and Biology/Biotechnology including practical tests in these subjects provided the examination is a University Examination and candidate has passed the earlier qualifying examination with Physics, Chemistry, Biology/ Biotechnology with English at a level not less than a core course.