The calendar at VCOM-VA seems to get tweaked some every year, so your schedule will most likely be different from mine. As
@AnonymousD.O. said, block 8 at VCOM is intended for a comprehensive review course put on by Dr. Rizk. Some people liked it, others didn't. I liked it, but had also bought DIT, and thus did not get through the entire DIT Part II course prior to taking my USMLE Step1 this week. Would it have helped if I had finished it all? I dunno - I'll get back to you when I receive my score. I am taking my COMLEX I in two weeks. Some of my classmates have taken both already, others are waiting until mid-late July to take theirs. You just have to attempt COMLEX I prior to starting rotations, and if you fail, you have until mid-December to pass before they take you out of rotations. I think you will find yourself tailoring your effort and study habits towards being competitive for your desired specialty. I've put in a lot of work recently because I want to do as well as possible since as of right now my most desired residency program has never taken a DO before that I am aware of.
Here is a link to the block 8 calendar for this year:
http://www.vcom.edu/meded/files/Virginia/Block8_VC.pdf
Also, try this link to the handbook:
http://www.vcom.edu/catalog/index.html#115 (If it doesn't take you to the actual page, navigate to page 115)
The handbook also mentions having to pass the COMSAE at the end of the review course. Plenty of people didn't pass it first attempt, but I think it's because it caught lots of people off-gaurd, especially the ones that weren't planning on taking the COMLEX until mid July.