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I tried and it worked thank you!
have you tried a different browser/cleared you cookies/cache?
I don’t think there is another way to access it other than through their website, when you say it is coming up blank do you mean like a blank new window?
Update: So this is how you should be able to access the Clifford Chance practice test, by scrolling down to the 'try a test' box on this link https://careers.cliffordchance.com/london/join-us/how-we-hire.html
However, it seems there is a system error with GetFeedback - the WG provider of the practice test. I assume they are working to resolve it so maybe just try again throughout this week.
I tried and it worked thank you!