Bought a practice exam, but it wouldn’t open at all and only displayed the Test Modes screen with no actual buttons or way to move forward. I tried other browsers and devices, even incognito with no extensions or filtering, and still got the same result. There wasn’t anything showing in the source code either. I also heard nothing back for 11 days after trying to reach them through their online contact form. Edit: after I posted this review, they finally got in touch, resolved the issue quickly, gave a fair explanation, accepted responsibility, and compensated me as well.