During Registration, you only will need to upload your Signature, Photograph, SC/ST/OBC-NCL/ EWS Documents wherever applicable. There is no provision to upload your Final year Proforma Certificate while filling up the Registration form for CAT 2020. You can check the Registration manual at the official website: https://cdn.digialm.com//per/g01/pub/756/ASM/WebPortal/17/PDF/Registration_Guide_CAT_2020.pdf . While filling the Academic section details,  please make sure that you have selected "Yes" for the question, "Are you in the final year of your Bachelor's degree?"  And you should calculate the aggregate or percentage of marks scored until the current semester and mention them in the given column.  The Final year proforma will have to be used during Counselling and admission after duly filled in and signed by the Principal/HOD. You can check the pdf format at: https://cdn.digialm.com//per/g01/pub/756/ASM/WebPortal/17/PDF/Final_Year_Certificate_2020.pdf