IIM Ahmedabad - Indian Institute of Management Vastrapur Answered Questions

I don't think you will get any decent college at 65 percentile. I suggest that you appear for CAT again and try to do better.
Here are two links that will give you detailed information about cutoffs and selection criteria. http://www.iimahd.ernet.in/programmes/admission-details/admission-procedure-for-pgp-2016-18-batch.html http://www.iimahd.ernet.in/users/admission/files/Shortlisting Criteria for PGP 2016-18 batch_110116.pdf
Let me know if you have further questions.

First of all you need to decide which college you want to target and depending on that you need to prepare for the same. For example if you want to target IIMs then you need to prepare for CAT. You can look up the syllabus on the CAT website. There is nothing new in syllabus, you have already studied everything. You just need to practice and take tests.

IIM Ahmedabad does not have a CAT percentile cutoff score. They have started a system of composite score where all the inputs like 10th marks, 12th marks, UG percentage, etc are used. Then an overall score cutoff is calculated. This method has certain advantages like, if you have not done really well in 10th or 12th, you can compensate that by doing really good in CAT.
Here are two links that will give you detailed information about cutoffs and selection criteria. http://www.iimahd.ernet.in/programmes/admission-details/admission-procedure-for-pgp-2016-18-batch.html http://www.iimahd.ernet.in/users/admission/files/Shortlisting Criteria for PGP 2016-18 batch_110116.pdf
Let me know if you have further questions.

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.

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.

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.

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.