No, you cannot. You can either store them in your car OR leave it in a locker with an administrator. If you choose to leave it in a locker, you have to turn off all of your devices.
Personal items include the following but are not limited to: cell phones, hand-held computers or other electronic devices, pagers, watches, wallets, purses, firearms or other weapons, hats, bags, coats, books, notes, pens, pencils, dictionaries, paper/scratch paper, and reference material.
The testing center will provide you with scratch paper. You cannot write on these before the exam begins or remove them from the testing room.