Here the Total percentile is being calculated by using the formulae:

{(No.of students with marks less than 57 marks )/(Total number of students appeared  in the MHCET exam )}*100

So as you see that you have to know that No. of students that scores below 57 marks and the total students appeared in MHCET , then you can calculate your percentile.

You can check this link for more info's: https://engineering.careers360.com/articles/mht-cet-result

I hope my answer helps you. All the very best for your future endeavors!