Research the topics covered on the Family and Consumer Sciences Praxis exam. The test covers a wide range of topics--from housing to nutrition and electronics-- which were covered in a variety of classes, so you must be able to utilize knowledge from information presented at different times and in different settings. You can get this information from ETS, the developers of the Praxis tests.
Gather materials from your coursework. Review these materials to gain an overall mental image of what you have learned in the course of your studies.
Obtain a professionally written study guide and/or other practice materials. These are available on the internet and prices range from $33 to $50 as of 2011. Most study guides available to purchase are written by reliable resources and educational publishers and should give you adequate review resources. Ask your professors which ones they feel are most reliable.
Take a practice test. Several website offer practice questions for the Family and Consumer Sciences Praxis. Taking a practice test will give you a better idea of how prepared you are for the actual test.