UWorld provides thousands of ACT exam-like questions so that you will get used to the format, difficulty level, and types of questions you will see on the ACT exam. But, more importantly, you are provided with detailed explanations for every answer choice. These rationales provide step-by-step problem-solving guidance, explain why you may have made a mistake, and help you deepen your understanding so you answer correctly next time. In addition, our self-assessments and performance reporting help identify areas you need to work on the most, so you don’t waste your time.