CBEST current exam guidelines state the following:
DO NOT bring any unauthorized aids or prohibited materials, listed below, with you to the test center. If you do bring any of these materials, you will be required to leave them in a designated area. For computer-based testing, a pen and a booklet of erasable sheets will be provided to you for taking notes, writing an outline, or otherwise preparing your response. Any personal items that you bring to the test center must be stored in a locker outside the testing room during the test. This includes jewelry, watches, wallets, and purses in addition to the prohibited materials listed below.
•Calculators and calculator manuals (approved graphing calculators are allowed for examinees registered for the CSET: Mathematics Subtest II [test code 212])
Good luck on your exam!