Dear friend, I am a graduated USMLE student. Welcome to med school! First of all, I recommend you to understand and NOT MEMORIZE the stuff you will face, plz. There are a lot of things to learn and definitely out of control if you memorize them. You don't have time for all the material either. So, talk to your advisors to give you a preview of the exams and curriculum first. Then, I personally suggest you to start doing the questions after each section you already studied. USMLE world is the angle powerful (necessary but may not enough for some) tool for your purposes whose questions/answers are educational rather than testing yourself. Make a payment and take a long subscription like for a year (for $420), it's worth it in this case. Then you need to prepare yourself for a 8-hour tiring exhausting exam. Be careful of your nutrition, sleep, breaks between your studies for a long run. Pathoma is a good collection by Robbin's pathology contributor. Mind you there is nothing COMPLETE SOURCE for the USMLE! Pathoma only covers parts of pathology, pretty good stuff though. Dr. Najeeb video lectures are another amazing source of videos and quite cheap and student-friendly for basic training, it really impressed myself. Dr. Lyonel Ramon is another professor and pathologist who owns a 4-day course of integrated cases. Kaplan notes+videos are not really student friendly but important in terms of gathering high-yield stuff.
All of these are based on your weaknesses and your training in med school. You may not need all of them except USMLE WORLD. However, keep in touch with your advisors and professionals in USMLE. Rock on. Good luck with your study.