There are a lot of factors in the variation of cutoff in met test. The main factor is the no of students attended the test and intakes.
They keep increasing the student intake for each branch and that can cause the cut offs to drop for the major branches.
If you want to join the main campus, you should score at least a 100/200 to get any branch here. If you want something related to CS, you should study well and get around 130+ in the entrance exam.