I have one year drop in second year of my BE now i am in my third year. I, want to pursue MBA am i eligible to give CAT for IIMs?

Yes, gap in study is not the criteria for eligibility but degree marks will be important, if you pass CAT. I am giving the criteria:- CAT Eligibility The candidate must hold a Bachelor's Degree, with at least 50% marks or equivalent CGPA [45% in case of the candidates belonging to Scheduled Caste (