I guess the admission process is already over for 2017–19 batch. So keep working hard, by next year you might even get a better option than Christ University.
About the difficulty level, it’s not that tough. I had 84 percentile in MAT and still got through also it’s not only about the percentile, I know many guys from my time who scored above 95 percentile but were rejected in PI round. So it’s also about how you present yourself to the interviewers, you role in a GD, your writing skills are also tested and last but not the least luck has a major role to play.