Did they let you get additional dry-erase boards at the 44th st. center?
Yeah, you can either do it in between sections or raise your hand mid-section and they'll bring it to you.
Obviously, if you fill up 75% of your board during the quant., I'd get a brand new board during the break. You don't want to burn any time waiting for the admin to bring you in a new board.
The dry erase board is like 5-6 pages, so unless you have big handwriting - 1 board should be enough for the entire test.
One suggestion, make sure the pen works before you walk into the testing room. I got a bum pen and had to raise my hand at the beginning of the AWA portion.