Hi, and welcome to the board.
At the test center, they will provide you with a scratch paper along a pencil to jot down your notes or numbers for tackling a question.
Manhattan GRE is not outdated. Probably is one of the best prep company in providing GRE practice material and mock test.
However, here on the board, we do have a bunch of material to practice as well. Let take a look here for quant
https://gre.myprepclub.com/forum/greprepcl ... -3523.html and here for verbal
https://gre.myprepclub.com/forum/greprepcl ... -3488.html . Plus tons of other material to help you in your preparation.
Ask for further assistance if you need.
Regards