The next iteration of the NAC OSCE is in March, to be a successful applicant with CaRMS one should obtain at least an 80% score on the OSCE. Now is the time to begin reviewing and practising. This will give you about 3 months of constant study and preparation.
A group of British medics have put together a great series of videos to help you prepare your basic skills for the NAC. These videos will help remind you of all the proper ways to conduct physical exams. Keep in mind that you will be asked to diagnose and treat patients in the NAC OSCE and that in order to pass the exam these videos do not provide enough information about diagnosis, management, and treatment.
You should be able to complete all of these physical exams without thinking by the end of January.