Each practice test has approximately 25 relatively difficult questions.  After answering each question successfully, a score will be computed upon final completion.  In depth explanations are provided for each question.  Should you not understand an explanation, your PC Professor instructor will be happy to help with further clarification.  Although your score on a practice test doesn't necessarily indicate what your score will be on an actual certification exam, a practice test gives you the opportunity to answer similar questions and can help you identify your areas of greatest strength and weakness.