I would read First Aid USMLE CS for sure. This will teach you how to think of clinical complaints and allow you to FOCUS.
The book gives you the QUESTIONS TO ASK, give you what PHYSICAL EXAM MANEUVERS TO DO, a list of DIFFERENTIALS, and WHAT TO ORDER, LABS, MEDS etc. If you have these down you won't be scratching your head and wasting time formulating a diff dx. You will be pulling these things from memory instead of trying to generate them from scratch. If even you remember only half of what is in the book, you will be fine. It is extensive.
For OMM, I would write out a list of body regions (UE, LE, NECK, BACK, PELVIS, etc) and how to screen, scan and define as well as ONE OR TWO treatments for these. Remember, YOU GET TO PICK TMNTS - do ones you know and like and are easy.
Your OMM soap note should include: 1.) Complaint - Neck pain 2.) Somatic Dysfunction - cervicals 3.) Segmental Diagnosis C3 RS whatever 4.) Treatment given - Muscle energy 5.) Treatment tolerated well (ASK THE PATIENT IF THEY FEEL BETTER AND RECHECK (or fake it) FINDINGS FOR IMPROVEMENT 6.) RTO in X days or X weeks for recheck 7.) dont forget xrays and labs if approriate
Practice writing your SOAP NOTES - over and over and over. Try to write one or two a day until your test and it will be second nature. Make sure you LIST THREE DIFF DX even if the diagnosis is obvious. Make sure to copy vitals to your noteright away. Also, if the patient tells you they have some problem (ie thyroid) - jot down a TSH in the PLAN SECTION IMMEDIATELY. That way you wont be copying or forget to put it in the plan. Fill in bits and pieces of the SOAP note during the interview if possible.
Don't try and write out every word from the interview - just pertinent positives and negatives.
Make sure you ask the patient's if they have any other questions before you leave. Make sure to ask them if they have anything else to talk about or forgot to tell you - at least it seems like you care. The First Aid USMLE 2 CS also has some tips on how to win points from the patients and how to answer thier ambiguous and challengin questions.
Best of luck with the re-take.