Here's the excerpt from ETS' link above that clarifies scratch paper usage:
The test administrator will provide you with scratch paper for use during the test. Scratch paper is not to be used before the test or during breaks. All paper, in its entirety, must be returned to the test center administrator at the end of the testing session. If you are observed using any document or paper other than the scratch paper given to you by test center staff, it will be confiscated. You may not bring your own paper and you may not remove any paper from the testing room at any time, or write on anything other than the paper provided (e.g., computer or workstation).
Other items that you're allowed to use and should bring with you on test day include:
- 3-5 sharpened #2 pencils: the test center does not provide these in many cases so your safest bet is to bring your own
- A snack for your breaks
- Something to drink on your breaks
- Photo ID
- Your test confirmation number