David - I suggest you watch all the videos and if possible adjust your test date around being able to complete all the videos. Now, perhaps you have some constraint which will force you to take the test sooner than that? In that case you may have a real challenge. However, I did have one idea for you. The PM Exam Simulator that OSP offers provides detailed reporting and if you analyze these reports you will see that it breaks down your scores by domain and by Knowledge Area. So, if you were looking to "target" certain videos from the PrepCast then you might want to look at your practice test results and see which knowledge areas you scored lowest in. For example, maybe if you took a 200 question random test the results would say that you did really good in HR and RISK and COMMUNICATION while you scored poorly in STAKEHOLDER, INTEGRATION & TIME. In this case, you could go to the PrepCast and review just the videos on these particular weak areas and then go back to the PM Exam Simulator and do a re-test with the result being that your scores improved in the weak areas, held steady in the other areas and your overall assessment score went up! That is the goal after all. Again, as I tell all my OSP coaching students, there is no substitute to reviewing all the PrepCast videos, but if you have some constraint that prevents you from doing that then this would be my advice to you. Regards - Dan.