SMEAT

The CET score doesn't tell you much. It just tells you how well you scored in the test. But that's not what the colleges require. What colleges ask for is your CET rank, which basically tells them how well you performed amongst others. You are given a rank based on the combined score of the CET test and board marks (equal weightage). So just a good score in CET is not sufficient. Your board marks also count. Moreover the difficulty of the CET paper and quality of students who write the exam differ each year. The board marks differ from student to student. So you can't generalise a good score. It's different for different students (based on their respective board marks). RVCE CSE Cutoff in 2015 was 288 and in 2016 was 239. On the other hand for ECE it was 374 in 2015 and 478 in 2016. Seeing a sharp demand for CSE the cutoff rank might come down to probably around 200 to 210. So a safe rank would be below 200. For ECE on the other hand, a safe rank would be below 400. All the best!
Thanks for reading.

For B.E / B. Tech course , the cut-off mark required for a seat in P.S.G. College of Technology is pretty much on the higher side. Exact marks required for each department varies each year but Maalini Kumaran 's answer roughly gives you the range. As pointed out, the Category you belong to, is a deciding factor.
However , for M.Sc 5 year integrated courses , the admissions are not merely based on the cut-off marks scored in your 12th exams. The department usually conducts an interview to select the candidates. Though your 12th marks are given some weight-age (usually,less), importance is given to your understanding of concepts.
Personally I feel that the MSc courses are well- structured and the placements are also in par with the B.E/B.Tech students.