Hey!

See, ranks are given to everyone by the score they attain. And, in jee the marks are given by categories also. Means, common rank list is the rank given to everyone irrespective of their categories, just on the basisof their score and if any candidate is from any reserved category then he or she gets rank on those basis also and the number of candidatesof same category appearing in the exam. So, in the same manner cutoff list is prepared and admission procedure takes place.

Candidates having category rank get seats on those basis if the college offers any category quota. Ex. If one of having around 1lakh CRL but is also having around 15k category rank so he or she will not get DTU with CRL but can get DTU with category rank.

College has to give a certain amount of quota for reserved categories such as minimum 15% for sc/st or anything.

Hope I answered your query

Thank you