Greetings of the day dear aspirant

The cut-off trends keeps changing every year and it depends on the number of students attempting the exam, difficulty level, number of available seats, etc. With marks of 179, you can secure a CSE seat in Sri Sivasubramaniya Nadar (SSN) College of Engineering in Kalavakkam as the closing marks for CSE branch was 167.25 in the year 2018 for SC Category candidate. So, just apply to their counselling process and you'll easily secure seat. Whereas, its not possible to secure a CSE seat at PSG College as the closing marks for the same was 190.25 for SC category in the year 2017.

https://www.careers360.com/colleges/sri-sivasubramaniya-nadar-college-of-engineering-kalavakkam/cut-off

https://www.careers360.com/colleges/psg-college-of-technology-coimbatore/cut-off

You can have a look at the detailed glance about everything related to SSN and PSG colleges previous year cut-off trends from the above link.

Hope I've cleared all your doubts!!

All the best for your future career