I have not got the 12th improvement marks original certificate yet from board..I had my imprvmnt from kota..from where should I get that???
As per the official the candidate who has appeared for an improvement of performance in a subsequent examination shall not be issued a separate certificate or a combined marks statement. Such candidates shall be given only a statement of marks in that subject. You can also refer the below given link for the further information.
http://cbse.nic.in/examin~1/certification1.htm
Good Luck!