The California Department of Education has a Cahsee test with answer key available on its website. Additionally, many test practice websites offer free versions of the test.
The state's website has a complete downloadable guide for the Cahsee, which includes preparing for the test, the test itself, and an answer key. The test can also be downloaded by the various sections.
Many district websites offer practice versions of the Cahsee. The Khan Academy, for instance, has 53 practice problems available on its website. These questions are pulled directly from the state's practice test.
Free-Test-Online.com has online math test examples and answers available. Likewise, 4Tests.com and TestPrepPractice.net has online tests available covering both language arts and math.