Starting the Foundation Programme can be challenging for many medical graduates, as medical school alone may not adequately prepare them for complex tasks like managing comorbidities or emergencies. Growing evidence supports the role of transition interventions to meet this knowledge gap, however data on the utility of situation-based learning are limited. This pilot study aimed to assess the efficacy of a near-peer case-based course in improving knowledge and preparedness for foundation training in recent medical graduates. Recent Imperial College graduates who attended a "Junior Doctor on Call" course were eligible for inclusion. This transition intervention, designed and delivered by a Foundation Year 1 doctor, covered six patient cases that integrated high-yield clinical concepts and practical tips. An online questionnaire was distributed one week before and after the course to assess perceptions of knowledge, confidence, and preparedness for training. Participants were also invited to attend an online semi-structured after the course. Out of 19 attendees, 17 (89.5% response rate) completed the pre-course questionnaire, 14 (73.7% response rate) completed the post-course questionnaire, and 3 completed the interview. 68.75% (n=11) had not previously attended a preparatory course for foundation training. Results demonstrated that 85.7% of participants felt more knowledgeable than before in the key topics covered. Participants also demonstrated an increase in self-rated confidence in commencing work as a junior doctor following the course, with 92.9% of participants stating that they felt more confident. This study offers support for short-term situation-based courses in enhancing medical students' knowledge and confidence for foundation training. These findings add to the growing evidence-base encouraging implementation of short-term courses in preparing for practice. However, further research on the utility of such transition interventions is critical to inform the development of evidence-based recommendations for recent medical graduates, educators, and programme directors.