Nikita, the results of CMAT 2020 have already been declared by the NTA and you can check it on the official website http://ntaresults.nic.in/resultservices/cmat-auth-20

The results or the score card contains the NTA Score secured by you which is actually the percentile which you have secured or the percentage of people you are ahead of. So, you do not need to predict your percentile using your marks rather you should check your NTA Score and you would get your percentile from it.

If, however, you want to predict the percentile using the 2019 marks vs percentile calculations in the MERIT LIST of CMAT 2019, then to be honest, it is very difficult to do so as the calculations change almost every year due to change in no of candidates and difficulty level of paper. However, using the 2019 marks vs percentile considerations, your percentile may be close to 25 may be in the range 24-28. But these are mere predictions based on previous years trends and you should check out this year results on the website mentioned above to check your actual percentile secured in CMAT 2020

If you want to know which colleges you would get based on these scores, you can use this CMAT PATHFINDER

https://bschool.careers360.com/pathfinder/cmat?icn=CMAT_path&ici=CMAT_article_view_sticky