Hi,

Well, if you were a CBSE student then you must have received a Provisional Report Card stating your marks in all subjects. If not, then i guess the application form may be accepting of GPA as well as marks.

Just contact the WBJEE, they'll be able to help you better. Here is the link with all their contact information:

https://wbjeeb.nic.in/WebInfoExam/Public/View.aspx?page=82