My problem on ODesk

I was so frustrated on how many times I took test on ODesk just to be a verified member, but I always fail and I’m all the way below the score, and no one will hire me if I’m not a verified member. ODesk has many job offerings especially SEO types like link building, manual web directories, social bookmarks, and one way permanent backlinks. Also included are blog, directory and press release submissions and some writings too.I don’t know how to pass the test because I want to be a verified member here on ODesk, and there’s no way I could fail again. I know that there are many SEO jobs there which I don’t know, but they’re on a bidding basis. It's one of my weaknesses until someone will help me on passing the tough tests on ODesk and to continue my journey on SEO opportunities