Hello Jasmine

For admission in CMC Vellore a minimum of 600+ is required in NEET. Every year the cutoff changes depending upon factors like total number of students appearing for the entrance exam, the difficulty level of the paper, the total number of seats available under state quota and related such. However for CMC Vellore the cutoff always goes high around 620-30+ every year and so you have no chances of admission in this college. Whereas, based on your calculated score you can get a seat in private college under state counseling. As the government medical colleges in Tamil Nadu have admission cutoffs in the range of 600-40+ marks.
Go through the previous year's cutoff of various medical colleges in TN for more idea:

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

Also based on your expected score, you can predict your chances of admission in other colleges by using the college predictor tool:

https://medicine.careers360.com/neet-college-predictor

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