Hello,

Your son's predicted marks for NEET 2020 is about 491, So I would suggest you to go through the rank predictor link for better understanding

Now, you are from OBC category and having Tamil Nadu domicile please follow the link below to know previous year's cutoffs category wise for both All india quota and State quota. https://medicine.careers360.com/articles/neet-cutoff-tamil-nadu

These cutoffs vary every year depending on several factors.

Now, according to your marks your son may not have a chance in govt. medical college but can secure seat in govt. dental college or semi government medical colleges. The fees are generally paid through the government portal in those private colleges

https://medicine.careers360.com/neet-college-predictor?icn=QnA&ici=qna_answer you may go through this college predictor link for your more ease at finding probable colleges.