What are these and High Yield Review and books that are recommended? What is its purpose and title/author...why is this sooo essential... I am just completey lost. THx really appreciate the information. I'm assuming it is for the USMLE Step 1 prep...but then I read a couple days ago that the Lippincott Biochemistry and other Lippincott series is essential for the USMLE Step 1 and I am wondering if I need both, all or a few...I'm wondering which is the best prep books out there...so that is my confusion. If there are any students that know what all these books and what is the most essential...that is I don't want what isn't neccesary, pleas share. Thanks again.