Material To Skip:
Some material that you can easily skip are 1) Step 2 CS Clinical Skills Review, and 2) Jaypees. Both of them are a joke, especially Jaypees - nothing about that dvd is helpful. The Step 2 CS Clinical Skills Review is pretty useless, but if anything, it was funny. I will try to at least finish watching the new videos.
Material that May Be Skipped:
The material that I think can be skipped are minicases/sample cases/differential diagnose lists. Most of this stuff is learnt when studying for other exams so I dont think it needs to be repeated for CS.
Practicing USMLE World and First Aid practice cases seem to be helpful and USMLE Step 2CS Core Cases explains a lot of solutions to specific scenarios (e.g., difficult questions, patient has difficulty laying down) that may occur on the exam.
Two osces books (clinical skills for the osces, the unofficial guide to passing the osces) add a detail here and there that can be helpful, however they are not needed for the exam. The university of virginia physical exam modules (http://www.med-ed.virginia.edu/courses/pom1/videos/
) provides many videos that can help you review physical examination techniques.