There are certain criteria to be eligible for Neet. As per the Neet eligibility criteria, the candidate must has passed 12th or equivalent from a recognized board with English and Physics, Chemistry annd Biology or Biotechnology (have to pass in both the theory and practical examination) with at least 50% (for general category) marks in aggregate of PCB (Includes both theory and practical score) and this is 40% for OBC, SC and ST candidates and 45% marks for PwD candidates. So, if you meet the above mentioned percentage criteria in PCB then you are eligible for Neet examination. If your overall percentage of class 12 is 46%, it does no harm. Only your PCB Marks will be considered and your PCB total is 155/300 that means 51.67% while the minimum PCB percentage for SC Student is 40% which makes you eligible for Neet as Neet is the only entrance examination for admission to all medical, dental and ayush courses. You can go through our article - http://medicine.careers360.com/articles/neet-eligibility-criteria