Before leaving any section or completing the exam, you have the opportunity to review your answers to most questions.
However, there is a series of yes/no questions that describe a problem and a possible solution and then ask whether the solution give is correct or not. These type of questions, you will not be able to review your answers. In addition, after you move to the next question, you are not able to change your answer as well. These questions are preceded by an overview screen that provides this information, and they include a reminder that you cannot change your answers to these questions during the review process.