Dripped Content & Restricting Access

Hi, I'm trying to figure out how to best set up the access to the site with dripped content.

I have Visitors, who can see all of the site except for one page, then I have my Week 1, Week 2, Week 3 & Week 4 levels. I want Week 1 to only see Week 1 on the restricted page, Week 2 to be able to see Weeks 1 & 2, Week 3 - see Week 1, 2, 3. Week 4 - see Week 1, 2, 3, 4. I thought I set it up right, but for example Week 4 can only see Week 4.

Also, I don't want anyone to have access to the admin area.

Sorry, still a bit confused on the content restriction stuff.