Dear Sayan, if you hold domicile certificate of Kerala, you are eligible for 85% State Quota. OBC candidates need to score 40% of the Top NEET score to be qualified in NEET. For example, if the Top NEET score is 400, you should scire atleast 100 to be qualified in NEET. And your merit rank depends upon your NEET score and Category. Based on previous year trends, if your score is 500, your ranknwill be between 10,000 to 15,000. However, this is a probability. Actual rank might differ.