Hello,

Not exactly cast but if you are claiming reservation, i.e., if you want to take reservation if you are SC/ST or OBC ( as only few college have OBC reseration) then you need to upload the category you fall in or under which youare claiming reservation. Hence, you need to have a category certificate if you belong to SC/ST/OBC category

Here is a link that will provide you with all details on the documents that you will be required to attaach while you will fill the application form

https://law.careers360.com/articles/clat-application-form

Further, CLAT 2019 form is not available and is available till March 31, 2019. Exam will be conducted on May 12, 2019 and application fee is 4000 for Gen and OBC and 3500 for SC/ST.