Hey,

The Caste Certificate of evey state usually comprises of a fixed format in which the starting digits appears same in every certificate of a respective state but the end digits keep on changing. You just need to fill the last 6 digit available in you caste certificate in the column asking for it in the CAT form. As you are also uploading the certificate along with it so there won't be much problem . For further more clarification you can contact the CAT helpdesk.

The official website , https://iimcat.ac.in/per/g01/pub/756/ASM/WebPortal/1/index.html?756@@1@@1

Hope that helps.

Thank you.