I think it's a great asset for you to "scope out" your test center. Your question is subjective man. Do whatever that'll keep you sharp and energized before the test. Good luck!
Its always better to be safe than sorry, so go there early. Take an easy game with you. I have read that you want to do some easy questions before writing the test, it puts you in the right mental state, especially cause you're advised to review and not do a test the day before.
If you get there too early, you can just walk around the campus and look at the trees and the sky, and kind of meditate. That should help release the stress before the test. The testing center is around 10 min from my house, and I am planning to get there 30-40 minutes before the test. I just don't want to be late!
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Take an easy game with you. I have read that you want to do some easy questions before writing the test, it puts you in the right mental state, especially cause you're advised to review and not do a test the day before.