Yeah I fell victim to that, too. Also having a timer counting down caused me to freeze up. I got about half the questions right immediately, and half after the time had ticked down so that my mind could relax and pay attention. I think I legitimately only got 2 wrong. And one of them I could argue that I found a different bug than the one they were looking for.
Completely agree, I got three wrong, but because I clicked the wrong spot, I only got 3 right, it's pretty frustrating.
The test is also pretty easy. I only know C and some Java and I figured most of the problems. The standout important questions to me were the memset and free ones.