Yes, it may be possible, but getting admission to a government nursing college does not depend only on your 12th marks.  The majority of the government nursing colleges provide admission based on the NEET examination and its cutoff. Since you have scored 230 out of 300 marks in the PCB stream, which is an excellent score, and makes you qualified for various nursing courses, such as BSc Nursing. Since you belong to the OBC category, the cutoff is usually lower than the General category, which can further improve your chances.