I have read the Powerscore CR Bible - and trust me it's the BEST CR Source - all the shortcuts by the all these prep companies and all (I had rather not name them) - you will realize are actually not their own techniques ...these were bluntly taken notes from CR Bible.
Caution: It is too big and time consuming - I will recommend you to read only if you have >45-60 days for your test
and if you want to go through just some quick revision and techniques for CR Questions
here are the page numbers which may help you
(pdf version page nos.)
Weaken 119-120
Cause & Effect 126, 146-147
Strengthen 170
Assumption 197-198
Method of Reasoning 231-232