If u don’t have certificate (I hope u talking abt other vaccine’s which are mentioned & not for covid) just write No, they won’t ask you to give the vaccine.
They will just take an x-ray, weight, height, urine test, blood test, that’s all there is to it. [as the case was for me]
An international student from a high-risk country for yellow fever is required to submit a yellow fever certificate upon the medical screening in Malaysia. However, other vaccinations certificate is required based on the medical screening requirement.