CAT 2016

I am a CAT 2016 aspirant,2012 batch graduate from NIT Rourkela with 2 years and 3 months of experience in Analytics domain.I am looking to persue my MBA next year and I am aiming for top B-schools.I have some questions regarding IIM admissions because my past academics are not so good . 10th/12th/ - 84%,77%,7.41/10). I am not sure that with these scorelines even if I manage to score good in CAT,I will be able to crack through.Can anyone share their experience and guide me how can the impossible be overcome ?