Do not enter units or symbols for free response questions that require you to enter a number. Unless it's specifically stated, do not use scientific notation to enter a number; use normal, decimal notation unless otherwise mentioned. Read specific directions for numerical entry problems. You may not navigate between questions, but you may mark questions for review later. Only the answers to questions you have marked for review can be changed. Do not exit the exam until you are cleared to do so, or your test may be lost and voided.