Hello Bharath,

Unfortunately you cannot use your study certificates dated.2018. Study certificate has to be signed in the current year and produced whenever they are required during the document verification.

KCET 2021 states the guidelines clearly for study certificate

"Study Certificate is submitted to show that the candidate has studied in Karnataka for a minimum period of SEVEN years from 1st standard to 12th standard or qualifying examination issued by Head of the institution. Further, School study certificates should be countersigned by the concerned Block Educational Officer (BEO)/Deputy Director of Public Instructions (DDPI) COMPULSORILY in the proforma prescribed. "

i would suggest you to take print out of the performa and get it duly signed before you submit the documents.

Good Luck, hope it helps!!