Dripped content? Is there a way out for this?

In the dripped content - it is not giving a dripped content rather upgrading you to different levels of subscription. Am I right?

How about person pays for a membership for a certain period - may be 365 days, and within this period contents are provided in a dripped format. The whole idea is that it is a educational site - and apart from paying student needs to graduate to another level (by passing out certain exam, or manually). Can we do this, how?

and ya, one more thing, on a subscription page it says - "free for 7 days, then pay 20$ for 100 days and then 10$ for 60 days" - looks fine when you are paying to move from one level to the higher one, but not in my case as dictated above.

Can anyone help actually?