Hello Rohit Mishra, I just checked the system test link and can confirm that the certificate is correct and valid. Visit this link -- https://home.pearsonvue.com/Clients/Microsoft/Online-proctored.aspxand select the "Run system test" option. This should open up a new page with a set of prompts to accept that you need to accept before installing the OnVUE application that'll do the system test. See the below screenshots.
Please do not forget to "Accept the answer” and “up-vote” wherever the information provided helps you, this can be beneficial to other community members.