Dilemma

I am an Aspirant of CAT’13,And a Mechanical Engineer,2013 pass out.I have 77.6% in Xth and 72 % in XIIth and expecting grad degree of 72%.What are my chances of getting into Top B-School ?And yeah I have a job in my hand(joining August).But pass…

I am an Aspirant of CAT'13,And a Mechanical Engineer,2013 pass out.I have 77.6% in Xth and 72 % in XIIth and expecting grad degree of 72%.What are my chances of getting into Top B-School ?

And yeah I have a job in my hand(joining August).But passionate for MBA.So what should I do??