Results probably won't come until mid-late July, so praying won't help. As for how passing scores are calculated, I went to a presentation by CFAI last year and posted my thoughts in this thread:
http://www.analystforum.com/phorums/read.php?11,481112,481638#msg-481638
I think what you really want is to either (a) answer a lot of questions correctly or (b) hope that the few top scorers do poorly. I put the table below together based on what I heard (see link). I asterisked the 9-question since that was observed by CFAI on one test - yeah, yeah, sample size of 1 is no good, but that's all I have. At the 9-wrong level by the top scorer, the average Joe needs a 67.4% to pass.
Total Qs_____240_____
Passing %___70%_____
# Wrong____Min
by Top______Passing
Scorer______(70%)_________Gross %
========================================
1__________167.3__________69.7%
2__________166.6__________69.4%
3__________165.9__________69.1%
4__________165.2__________68.8%
5__________164.5__________68.5%
6__________163.8__________68.3%
7__________163.1__________68.0%
8__________162.4__________67.7%
9**________161.7__________67.4%
10___________161__________67.1%
11_________160.3__________66.8%
12_________159.6__________66.5%
13_________158.9__________66.2%
14_________158.2__________65.9%
15_________157.5__________65.6%