As of 2014, Seton Testing sells a guide called "Scoring High on the TerraNova/CAT" that contains practice questions for the California achievement test. Christian Liberty also sells practice tests for second through twelfth graders.
As of 2014, there are no free practice tests available for the California Achievement Test, but there are many that can be purchased from various publishers. Aside from the two already mentioned, The Family Learning Organization sells very inexpensive practice tests for first through third graders. While the older CAT/5 test is no longer administered, some publishers, such as Piedmont Education Services, loan or rent the original teacher's editions complete with the original tests, which must be returned to be scored.