Hi Bittu, 

I believe you have secured 99 percentile in CAT and wish to seek admission in FMS Delhi. Now, I can also observe that you have dropped a year before class 12. The good news is that you have a good chance of getting FMS Delhi, based on your CAT score. 

The marks scored in class 10 and 12 matter, but it is graded on a point-system, and I don't think you need to worry about them. 

All the very best!