I think Paul is right.
The most important factor is basic fundamentals.
I'm just done woth my all KAPLAN CATs here are my scores.
CAT-1; 540 Quant-40; Verbal-18
CAT-2; 660 Quant-49; Verbal-33
CAT-3; 660 Quant-50; Verbal-30
CAT-4; 650 Quant-51; Verbal-28
CAT-5; 660 Quant-49; Verbal-31
I found myself ok with CR, but RC was horrible and SC sometimes ok sometimes.......

.
And i think if i were worked on my SC section a bit more i had done better than this.
But RC is just a game of concentration, I can say i drove my score totally with CR & SC. Sometimes i did ok on RC sometimes i got totally busted.
Just work on fundamentals.........that's it