Hey there, Mech and Civil are the most demanding courses here at CUSAT after Navel & Ship Building. So, I recommend you to study and prepare well for the entrance test. Personally I dont think marks dosent matter for entrance exam. Its all about how you prepared for the exam and give it a full try. All you have to do is shut down your computer rather than asking questions like this and study for your exam. Try to be the topper so that you could select any course you want.