Yes, I would take it timed. Even if you don't take it timed yet you're taking the same amount of time, you might have a psychological advantage...you could be in a more relaxed state. Seriously, I've done a few untimed and taken the same amount of time, and the stress factor hasn't really been there. Stress is important to simulate, you need to get used to it. I strongly discourage rationalizing tutor mode as a learning tool...part of learning is getting desensitized to stress, and if you make yourself do timed UW questions daily, you're going to help yourself cope with stress better. Also, if you're getting reassurance and confidence by seeing that you're getting questions correct as you go along, that can be an unfair advantage. You could argue the other way...if you're getting more wrong...but honestly, MAXIMIZE the exposure to true testing conditions. Take it timed. Good luck.