i work really hard for Cat but still i am getting pathetic scores in Mock Cat. I think i have problem in attempting the question paper. so what should be my correct approach to attempt cat?

You still have around 4 and a half months left for CAT and its good that you have started attempting mocks. From mocks, you would have understood your weaknesses. You would know that in which topic you can solve questions quickly and which ones take time. So my suggestion would be to attempt those questions first which you are more confident about. Let me give you can example, arithmetic is my strength so I always start the paper and find arithmetic questions and finish those in first 20-25 minutes. It not only helps you in terms of score but it also gives you the confidence. Same goes for other sections also, start the paper with your strengths. Meanwhile work on your weak topics so that you don't miss out on easy to moderate questions from those topics.
Hope it helps.