Hello aspirant

hope you are doing well and safe. With reference to your query,  I would glad inform you that at your marks you holds very low chances of getting seat in mmc college . I would strongly advise either look for other options or start preparing for next attempt and score atleast above 620 to get in mmc chennai . Following is the link of cut off for reference:-

https://medicine.careers360.com/articles/neet-cutoff-tamil-nadu

Hope you found this answer informative. Best wishes for your future