I don't know . So that your friends are helpfull for this

ACPC merit rank is calculated from your GUJCET marks, earlier they used JEE main marks and its percentile. So ACPC merit marks is calculated from combining 40% of your percentile of your GUJCET marks and 60% of your percentile of PCM 12th Board Marks , whether it be GSEB, CBSE or ICSE. And according to your merit marks you will get your rank.

To know about the rank and further process you can check the details below:

GUJCET Counselling

Hope thios helps you.