Looking for logging into the Salesforce Exam site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Salesforce Exam site. After that you can login as usual with your login credentials.
https://www.webassessor.com/wa.do?page=publicHome&branding=SALESFORCE
https://trailhead.salesforce.com/credentials/administratoroverview
http://certification.salesforce.com/home
https://trailhead.salesforce.com/credentials/administrator
https://trailhead.salesforce.com/credentials/redirections
https://help.salesforce.com/HTViewSolution?id=000186542
https://trailhead.salesforce.com/credentials/verification
https://help.salesforce.com/HTViewSolution?id=000205869
https://partners.salesforce.com/s/education/general/Certifications
https://partners.salesforce.com/s/education/general/Webassessor_for_Partners
https://success.salesforce.com/answers?id=9063A000000idlMQAQ
https://trailhead.salesforce.com/credentials/servicecloudconsultant
https://trailhead.salesforce.com/credentials/architectoverview