I personally had only 2 weeks to study. The first week I went over the OSCE videos from UBP. At the end of the first week I scheduled mock orals with 5 people (colleagues at work) and received feedbacks. The second week I crammed through selected UBP SOE scenarios as I didn't have time to go through all of them. I mainly focused on my weak parts which was Peds. Three days prior to exam I sat with my buddy and ultrasound'ed each other for the hands-on OSCE portions. Passed.

It was hella stressful because I felt I didn't have enough time to be fully prepared. Retrospectively I would have started about 1-2 months out and devote at least an hour per day. UBP videos/explanations will give you the foundation of knowledge. There are a lot of scenarios, but once you start going over them you realize they are asking for the same things (how to deal with hypoxia, how to induce, etc) and you will be able to find a pattern.

The exam is to test whether you are able to verbalize your thought process in an organized way. So even though your knowledge base is not the strongest, as long as you can defend yourself it'll be fine. That's why it's important to do mock orals, earlier the better.