If you have the certificate it is good as in some cases(exams) it is mandatory to bring the covid certificate. It is mentioned on the admit card.
But in some cases(exams) they only demand a declaration certificate from your end and the declaration form has some details that you have to fill out.
Format of a declaration certificate:
NOTE: Plz make sure before leaving for an exam that what has been demanded, a covid certificate or a declaration form. If the declaration has been demanded they will provide the form with the admit card or if the certificate is mandatory you have to download it.