hey my mac was doing the same thing for the proctor-u pre-test check. you can call proctoru or talk to their live chat, and they'll send you to a different pre-test check site. as long as your computer works with THAT test, you'll be fine.
Here u go: https://support.proctoru.com/hc/en-us/articles/360043127892-What-am-I-allowed-and-not-allowed-to-do-during-my-exam-
Talking aloud: Unless you have an accommodation, talking or whispering aloud during the exam is not permitted.
I had that same issue mine said RAM 97% of 90%. I closed down the browser and logged in through the extension by clicking on the chrome extension. It has the Proctor U Owl. It worked fine after that.
... through technician after technician on ProctorU, trying to change my settings ... had to call LSAC because ProctorU could not find my test ... record of a January test. ProctorU told me to call LSAC ...