The study investigated the effects of structured simulation training ready4gyn on the skills and self-concept of final year medical students in obstetrics and gynecology. It was a quasi-experimental before-after study with an intervention group (N=65) who completed the training and completed both self-assessment (19 items) and objective assessments (14 items) on 7-point Likert scales before and after the training. In the intervention group, self-assessed competence increased from a median of 50 to 54 (p < 0.001) and objectively measured skills from 27 to 47 (p < 0.001). The difference between self-perceived and actual performance was reduced to almost zero (p < 0.001). At the end of the rotation, the intervention students reported higher self-rated competence than the comparison group in the standard rotations. The conclusion says that participation in ready4gyn brought a significant increase in perceived and objectively measured competencies, supports the integration of simulation training in undergraduate education in obstetrics/gynecology. The conclusion is limited to self-assessment between groups, as only the intervention group had objective assessments.