2 High DA Edu Links
2 High DA Profile links
2 High DA Web 2.0 submission (any of the following - gather, quizilla, vox, wikispaces, webs, hubpages, zimbio, friendster) or (DA 60+)
2 Guest post/PBN posts
2 Edu wiki blog posts
Tier 2:
5 bookmarks to each of the above links