MBA Entrance Exam

80 percentile and above would be a good score to get a call. Conversion solely depends on how you perform in the interview

Yes CMAT score is accepted along with CAT, XAT and GRE scores

IITs, FMS Delhi, MDI Gurgaon and many more colleges consider CAT result for admission and to get admission in IIM, CAT is the only exam.

Hi,
You can start preparing from right now. It's better to join a reputed coaching institute. But, as you have almost 2 years to give CAT 2018, start with self-study and go through all the basic and after knowing about your strength and weakness in different areas join a good coaching institute. This would ease your preparation a lot. Be like the tortoise from the motivating story "The Tortoise & Hare". Have the zeal like the tortoise and succeed.
All the best!

MAT is conducted 4 times a year. Try for MAT again and try to secure 600+ to get a call from Christ University.

Although the cutoff varies every year, you need to score around or more than 80 percentile in CMAT. You also need to consider the following weightage of selection parameters:
Scores in CAT/CMAT - 50%
Performance in GD/PI - 30%
Past Academic Record - 20%
Relevant work-ex

The cut-off for IBS Mumbai is 70+. Yes they accept all these exams and there scores.

It is difficult to get NM colleges like NM Bangalore and Mumbai at this score.

S. Chand, R. Agarwal and Arihant series are the best preferred books for CMAT.

You can try for UPES, their NMAT cutoff is above 160 marks.