Do a forum search on calculators. Its important that you have a calculator that can perform two-variable statistic functions. You want to be able to do correlation, regression, and standard deviation. I used the TI-36X. My calculator proved invaluable during this exam.

I didn't use the Cliff Notes so I can't comment, but I did use the 'Statistics Workbook for Dummies' (note: not the 'Statistics for Dummies'). The workbook also helped a lot.

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CLEP exams passed:
Management, Accounting, Marketing, Macroeconomics, Microeconomics

DSST exams passed:
Human Resources Management, Organizational Behavior, Statistics, Management Information Systems

Earned:
B.A. in Business Administration: Technology Management (magna cum laude) from Saint Leo University

In Progress:
M.S. in Leadership and Business Ethics from Duquesne University (24 credits completed, 3 credits in progress)