Hi,
Hope my comment is not too late as many have already sent their admissions. It is true that Computer Sciences is a low scoring subject, as i my self am an MCS with above average CGPA throughout the degree. But in CE-2016 i got 40~ range marks in both paper A and paper B. But still it helps alot for a person who is already in IT and Computer Science and save few days from preparation (but doesn't mean you dont have to take a single look ). Also opting for relevant subject helps keep the psychological pressure off during exams upto some extent.