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From this year 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.

whereas ITNU merit number is calculated according to your JEE Main score . A merit list is made on the JEE Main Score obtained by the candidates.

You can also find suitable college according to your percentile .

you can  check out your college options from here