materials allowed in exam

i haven't found this listed elsewhere, and am wondering what you are allowed to bring in to the exam with you. Just you and your brain? Or can you bring/or be provided with scratch paper? Some of the questions on the mock exams are easier for me to work out if I can write a few things down - particularly the ones involving math operators.
Speaking of math operators, how difficult are the operator questions on the real exam? In one mock exam, questions over things like "result of -1 >> 400" seem difficult at first, but turn out to be simple if you know that -1 >> anything is -1. Is the real exam any more difficult than that? If so, I hope calculators are allowed...

When I took it, I didn't need anything. They provided everything I needed, but I would advise bringing some scratch paper and a pen, just in case. You can't bring a calculator, but you don't need one anyway. There weren't any difficult bit operator questions on my version of the exam.

I was given a small white board and marker. That's about all you can have, though it may vary at different testing centers. I couldn't even take a bottle of water in with me.

You should be able to take water in with you. What if a person has health problems. Diabetics need to drink a lot of water.

All I got were the whiteboards and markers as well. although I also got earplugs. This is probably standard since it is the same company giving all the tests. At least in US.

I was also given a board and pen that I could write notes on. Nothing else. No phone, no wallet. Really just me and my brain.
I didn't try to take in a bottle of water, but they did show me where the bathroom and drinking fountain were so if I needed, I could use either.

I was also given some scratch paper, a pencil, a glass of water. They did not show me where the bathroom is.