IIM Ahmedabad - Indian Institute of Management Vastrapur Answered Questions

Almost all IIMs have already released their shortlist and I believe interviews for the same would start next week. So, if you haven't received call from any of the IIMs, I don't think you will receive any call from IIMs. Also I don't think 88 percentile would get you calls from other good institutes like FMS etc. You should try again next year and you should prepare well for the same.

No. Work experience is not necessary either for appearing for CAT nor for admission. However IIMA encourages you to have work experience before joining. FOr the same they offer deferred admission, which means if you are accepted in 2017 then you can go work for two years and join back without taking CAT again.
In short: you can take CAT when you graduate.

For general category student, I don't think you get interview call from any good MBA college. Also because of your low graduation percentage, you will find it difficult to get a call from good college. I would suggest that you prepare well and try again next year. Please keep in mind that you will need to score really good in CAT to get an interview call.

IIM Bangalore gives more weightage to past academic performances + work experience and less weightage to CAT marks whereas IIM A&C gives high weightage to CAT marks only. So, you've got high chances with IIM A&C if you score well in CAT and medium chances with IIM Bangalore.
IIM Bangalore Final selection (66 Marks) = CAT (20) + X (15) + XII (10) + UG (15) + Work Experience (6). So, 30% of the weightage given to CAT and 70% weightage given to academics + work experience.

Almost all old IIMs have already released their shortlist and I believe interviews for the same would start next week. So, if you haven't received call from any of the IIMs, I don't think you will receive any call from IIMs. Also for all other MBA colleges that accept CAT score, you need to apply before the results are out. If you have applied to other colleges, wait till they release the shortlist. However with this percentile you should expect calls from new IIMs.

To get into IIM-A, you must hold a bachelor's degree with at least 50% marks or equivalent CGPA.
After that you need to give CAT exam. Performance in CAT is an important input in the admission process. You should note that it is important to perform well in each section of the test. In addition to the performance in CAT, IIMA uses academic background for short-listing for AWT & PI.

If you want to take admission in IIMA then you need to do graduation first with more than 55%. After that you need to clear the MBA entrance exam- CAT and score 99 percentile then only you can get admission in IIMA. But it's good to see your dedication. All the best!