Our notes which includes key to remember (summaries) , charts and other shortcuts are of around 900 pages + PM (Use PM analysis file to cover efficiently) are sufficient for exams. Last time also around 95 marks out of 116 marks came from this combination. I agree 20 marks paper was from remote corners of module. Well it is difficult to cover those 20 marks as it comes from remote areas.
So i will suggest follow above combination + RTP. And if time permits catch hold of module see following things
1. Content in bold and italics (as it is recent addition)
2. Content where diagrams are made.
3. Content where case studies or highlighting is done.
as per my analysis last time many questions were from above areas.