IIM Ahmedabad - Indian Institute of Management

Placement is not an issue at IIM-A FABM. People get placed in a matter of hours. Profile ranges from marketing to supply chain management in agribusiness and some FMCG companies.

You have got fantastic score and you are surely eligible. You can also check alternate colleges with similar ranks below:
https://www.shiksha.com/mba/ranking/top-mba-colleges-india-accepting-gmat/2-2-0-0-310

Yes, you can take admission in other courses. The cutoff for HR is higher than others. You can go for marketing, finance, IT or RM.

I believe, basic mathematics is a must for MBA exams and later stage in life as a manager also. I would suggest you to practice and get acquainted with basic mathematics, and then think about doing MBA in IT in any college with decent placements. Without a decent score in exam will refrain you from a good college.

Civil engineering won't help you much while doing your MBA. At the same time it won't put you at a disadvantage either. But incase you are inclined towards engineering degree, the closest you get it by choosing Operations specialisation. Good luck!

You sure do. But aim for a higher percentile in the range of 99.6+ for getting a call & converting it .

Very less importance on extra curricular activities, more on work experience,internship, certification and academic qualifications are given at all top B Schools.

You should either opt for finance or business management as they will suit your educational background.

IIMs consider only CAT for admission to their MBA programmes they do not accept any other management exams.