If you're taking the online PMP proctored exam, you will not have scratch paper but rather a "virtual whiteboard" similar to MS paint. It's pretty useless for the online exam and will not be very helpful for a brain dump before the exam. You'll have a virtual calculator. For my online exam I didn't need the calculator at all. I've not seen much feed back that if you take the exam in a Pearson Vue office if you'll be given the scratch paper. My advise is to practice writing out the 49 processes on scratch paper every day as well as the EVM formulas. Once you can do that, you won't need the scratch paper for the brain dump. There's some good YouTube video that can help with the memorization of the 49 processes via word phrases or acronyms.
As for the question about taking the exam, the 4 hr clock counts down as MINUTES, that can be confusing if you don't practice that way. The 4hr clock counts for the entire test. The only time the clock pauses is if you take the scheduled 10 min break. e.g If you take the first 90 questions in 30 mins, then the 10 min break, you'll have 3:30 mins for the second half (110 questions)
-Bryan