You souldn't worry so much about time. On some practice tests, I was running out of time occassionally, but on the real thing, I ended every section with spare time except for QR. I just used the spare time to go over my "marked/incomplete" questions and to rest my brain. You can skip past the entire section, but you musk click through each question, and then go back and review your incomplete at the end. My advice would be just to go straight through, you don't need any extra distractions during the test.