I just 2 days back finished my 2nd year b.com exams i wanted to do my mba in finance after my final year when should i give my cat exams .

Hi, Its indeed a nice decision. You can appear in CAT now, End of July forms will be out. But you should focus on CAT 2014 for admissions. Well and good if you get a good score in 2013, but it will give you an idea as to which area you need to focus. If it's English and vocab, or quantitative skills