When your hour building, get hold of the CPL tolerances for test and try and teach yourself to fly with-in them. On cross country flights, fly calculated headings rather than feature crawling and adjust your heading accordingly if you have drifted off by using either the 1:60 rule or drift lines and try and make your routes as direct as possible.
Learn about holds and hold entries and NDB tracking for the IR, and practice on RANT, but try not to get fixated on just watching the needles, as you need to fly the a/c on the AI when doing it for real in the a/c or sim.
Personally, I wouldn't waste money on so many books. Your flight school should provide all the info you need.
