Hello Ashik,
Last year's cutoffs for mechanical engineering in CIT was 1422(opening)-3326(closing) in general category. So it will be difficult for you to get a seat in mechanical engineering in CIT.
However, you can get other branches, visit this link to predict your college based on your TNEA rank:
https://engineering.careers360.com/tnea-college-predictor
Best Wishes.
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