The Royal College has made a number of videos to guide you through the various components of the Primary OSCE. A link to the full playlist is offered below.
Although the College warns you against seeing these as a standard answer they do offer a standard towards which you can work. The commentary to the video has changed a little recently, now offering a little more insight into what makes a strong candidate. They are worth a re-look even if you think you are familiar with the content of them. Along with the video offered you as part of the course you can use these resources to reflect on your own performance and perhaps begin to practice elements within each video to improve your technique.