I tried the bible and did not see significant improvements. I would say try 7 sage, and focus on practice and reviewing over and over. Marking so much only wasted my time. Actually, all the powerscore bibles did haha.
Just to make sure. VIEWSTAMP is from the PowerScore Reading Comp Bible. It stands for View= the different viewpoints in the structure, S=structure of the passage, T=tone of the passage, A=arguments in the passage, MP=main point