Hii,

CAT is a National level common Entrance test to get admission to MBA course . The Basic eligibility criteria to apply for CAT exam is one must have passed graduation with minimum 50% marks or equivalent CGPA. Final year students can also apply for the CAT exam. As you are in third year you are not eligible to write the exam. Your Academic marks are also not good. You won't get FMS Delhi.

If you are from general category this is a bad news for you as your 10th and 12th % doesn't fulfill the eligibility criteria but it also depends on graduation score as some management colleges doesn't consider 10th 12th score so you can target that. .. As far as fms is concerned you are going to suffer really a hard time converting it... Anyways all the best