You haven't mentioned the State you hold the domicile of. This is important because every State has different cut offs for various Categories. With a score of 512, your rank might be approximately between 38822-44553 . This is an expected rank range: https://medicine.careers360.com/articles/neet-result-marks-vs-rank . Now regarding the Colleges that you may have a shot at, we will need the State you belong to. Alternatively, for complete list of colleges that you may have a shot at, please use our College predictor: https://medicine.careers360.com/neet-college-predictor?icn=QnA&ici=qna_answer