I dont think "tricks and approachs" can help much in CR.
You have got to thoroughly learn argument construction.
I think this can be done in the following ways:
-separate questions according to argument construction
/type - Powerscore LSAT Logical reasoning
bible does a great job for this.
-Learn how the questions are asked (weaken, inference, etc - they are getting very creative in this!)
-learn type of wrong choices used to disguise correct one (out of scope; opposite; faulty use of details, etc)
-if you are in "learning mode", dont time yourself UNTILL you are comfortable with all points above - VERY IMPORTANT!
-Dont do too many questions in one sit UNTILL you are comfortable with all points above
Also, at the heart of CR lies formal logic techniques; you may wish to buy Powerscore's Logical Games Bible to address this.