membership settings for drip content for cumulative content access

My goal is to create membership settings that give subscribers access to lessons in the following manner:

week 1: videos 1-5

week 2: videos 6-10 (and all prior videos)

week 3: videos 11-15 (and all prior videos)

week 4: videos 16-20 (and all prior videos)

how can I accomplish this with the membership plugin?

presently, it appears as though members are not progressing thru drip levels (for example, a test user with a finite subscription t=1 day does not progress to the next level at the end of one day.)