You need PUC study certificate. It’s format is there in CET e-brochure and also in the brochure which you got after your chemistry exam.

My friend contacted a KEA official, he said that no need to counter sign the PUC study certificate by BEO.[only puc study certificate, you have to countersign your primary and highschool study certificate by BEO].

She even asked BEO to sign the PUC study certificate, so that she wanted to go in a safe way, but BEO refused to sign and said no need to sign the study certificate.