greetings applicant,

here is the general list you can refer to for cutoff however the current list for 2019 has not yet been released,

OC :maths,physics,chemistry put together 50%

B.C. maths, physics,chemistry put together 45%

MBC. maths, physics,chemistry put together 40%

SC/ST:maths, physics,chemistry put together 40%

all the best!

Hello there,
Admissions to SSN college of engineering, Chennai is through TNEA counseling only. And, for procuring a seat through counseling, a cut off score of 185 or above would remain a safe zone for OC category. Also, you have not mentioned which category you belong to. Rather than percentile, only cut off marks will be considered for admission. Other than TNEA counseling, you have another option, they is through the management quota. But, for this, I think it is too late by now.
All the best