CAT

The basic minimum eligibility required for admission is given in the college website. This is the link http://www.iimshillong.ac.in/admissions/pgp-admissions/#w349 . The details of the percentile, marks in Class X, XII and the breakup of different components for the admission will come out in due time.

You have to give CAT again for consideration

CAT is a highly competitive examination. Candidates have to score very high marks to seek admission in top B-schools. If you do not get admission in any of the top 30 B-schools, you can reappear with better preparation. In order to mitigate your risks of losing time, you may also appear in other MBA entrance examinations such as XAT, MAT, etc. You can also do MBA from Tier 2 and 3 B-schools.

The forms for CAT, 2017 will be out next year only, so you can apply next year.

If you're not taking any chances, you naturally appear for both to increase your range.

Hi clain39378,
The application deadline for registration is 3rd Jan 2017.
CAT is on Dec 4 2016,
XAT is on Jan 8 2017,
CMAT is on 28th Jan 2017.

Hi Vijay,
It depends on your category if general 99.8+ would be sufficient. However, percentile is not the only criteria but it is still the first step, IIMs look for overall potential and capabilities of students in selection.
All the best.

Hi Rathna,
It depends on your category if general 99.8+ would be sufficient. However, percentile is not the only criteria.IIMs look for overall performance and potential of a candidate apart from academics, there is a significant shift in the selection process from academic-centric to overall performance and capabilities of the students. I suggest you participate in extracurricular activities, competitions, tech and cultural fests and publish papers in journals.
All the best.

CAT is conducted by IIM and is a pathway to most of the top colleges of India while MAT is an exam for Tier 4 or Tier 5 colleges. MAT has GK section in exam while CAT does not have.