Before considering taking a college level statistics class then you must be confident that you have the basic mathematical skills required.

Here is a link to a grade 12 math equivalency test that I posted online.  The answers to this test provide many links to resources for brushing up your skills. The answers are posted as a link at the end of the test.

If you scored better than 15/20 then you can be assured that your math skills are sufficient for introductory statistics at the college level.  And if you are majoring in statistics then you better have gotten 20/20 ;)