Is it not possible even for BC category? 186 aggregate and aptitude score 52 at SSN..to get into mechanical stream.
Hence no chances.
You can rather get following colleges under TNEA :
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Saveetha engineering college
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Vsb engineering college
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St thomas college of engineering.
https://engineering.careers360.com/colleges/ssn-college-of-engineering-kalavakkam/cutoff