Stephen, if you haven't already, check out these posts for good information on OCS, hope they help:
http://www.airwarriors.com/cgi-bin/topic.asp?TOPIC_ID=281&FORUM_ID=5&CAT_ID=1&Topic_Title=OCS+academic+gouge&Forum_Title=Paths+to+a+Commission
http://www.airwarriors.com/cgi-bin/topic.asp?TOPIC_ID=283&FORUM_ID=5&CAT_ID=1&Topic_Title=OCS&Forum_Title=Paths+to+a+Commission
http://www.airwarriors.com/cgi-bin/topic.asp?TOPIC_ID=159&FORUM_ID=5&CAT_ID=1&Topic_Title=Preparing+for+OCS&Forum_Title=Paths+to+a+Commission