Taking mock tests is an important part of preparing for USMLE (United States Medical Licensing Examination). Mock tests help you assess your understanding of the material, identify areas where you need to improve, and get familiar with the exam format. Here are some options for USMLE mock tests:

1. NBME Self-Assessment: The National Board of Medical Examiners (NBME) offers self-assessment exams for all three steps of the USMLE exam. These exams are designed to simulate the actual exam and provide detailed performance feedback.
2. USMLE-Rx: USMLE-Rx offers a question bank with over 3,000 practice questions that are designed to simulate the USMLE exam. The platform also offers performance analytics and the ability to create custom tests.
3. Kaplan USMLE: Kaplan USMLE offers full-length practice exams for all three steps of the USMLE exam. The practice exams are designed to simulate the actual exam and provide detailed performance feedback.
4. MedQuest: MedQuest offers practice exams for all three steps of the USMLE exam. The practice exams are designed to simulate the actual exam and provide detailed performance feedback.
5. UWorld: UWorld offers a question bank with over 2,000 practice questions that are designed to simulate the USMLE exam. The platform also offers performance analytics and the ability to create custom tests.

When taking mock tests, it is important to simulate the actual exam environment as much as possible. This means taking the test in a quiet environment, without distractions, and without using any notes or study materials. After taking the mock test, review your performance, identify areas where you need to improve, and adjust your study plan accordingly.