Here are below given the documents required to fill CLAT application form.

   Birth Certificate or Passport
    High School marks-sheet
    10+2 Qualifying examination marks sheet
    Recent coloured passport sized photograph
    Candidate’s signature
    Category Certificate for candidates belonging to SC/ST/OBC category
    Disability Certificate for Physically handicapped candidates
    Special Category Certificate of Bihar; Dependent of Freedom Fighter of Bihar and Kashmiri migrant (if applicable)
    NRI/NRI sponsored candidate (if applicable)
    Domicile certificate under State Quota (if applicable)

You can check the further information with the given below link.

CLAT Application form

Good Luck!