Rahul,
Module 70 is based on PMI's official
PMP Examination Content Outline
. This PDF document is the "basis" for the PMP exam and as the first step in creating it PMI did a "role delineation study". The tasks that you see in the document (and are presented in Module 70) are the tasks that a project manager is normally working on / responsible for.
All questions on the PMP exam are based on the tasks that are described in this document. In other words: If you understand these tasks, then you have a general idea about what topics/tasks the questions will be about. (Silly example: There is no task about "dishwashing" in this document, so none of the questions on the PMP exam will be asking you about the proper dishwashing methodology.)
My recommendation for aspiring PMPs is that they should use this document as a means of verifying that they have a solid understand all the tasks described herein. So pick any task from the document and make sure you know what it's talking about, what tools to use, when it happens in the project life-cycle, which skills you might need, etc.
Module 70 can therefore be used as a "checkpoint". Once you have reviewed 1-13 you can watch these lessons again to see if there are any tasks where you feel uncertain and some deeper studies are needed.
Until Next Time,
Cornelius Fichtner, PMP, CSM
President, OSP International LLC