Consider completing this CSET in two sessions: one for the two General Science subtests 118 and 119, and another for your specialty area: 120-123. Read the descriptions (links below) of all three to help you decide where to start.
Thoroughly acquaint yourself with CSET information and practice test questions:
Print out the descriptions of each subtest listing all the topics addressed in all versions of the CSET General Science, and for the individual specialty subject you plan to take: Chemistry, Biology, Physics, and Earth Science from the link http://www.cset.nesinc.com/CS_testguide_Sciopener.asp.
One student studied all the CSET topics listed above from Wikipedia.
(He probably over-prepared, he thinks, but felt so comfortable on test day.)
The science framework is invaluable and is your ideal study guide. Start reading from 6th grade onwards: http://www.cde.ca.gov/ci/sc/cf/index.asp. This is the content you will need to master as a Science teacher.
You may wish to look at the New York Regents Exam material online at http://regentsprep.org with study guides, strategies, and old exams for Earth Science, Living Environment, Chemistry, and Physics.
Make sure to read relevant sections of the CSET Tips page as it contains invaluable strategies to help you do well on test day.
Utilize the free-of-charge online test preparation sites available at UCI's Open CourseWare website:
CEST Science Subtest I: Astronomy - http://ocw.uci.edu/courses/course.aspx?ID=30
CSET Science Subtest I: Earth Resources - http://ocw.uci.edu/courses/course.aspx?ID=31
CSET Science Subtest I: Electricity and Magnetism - http://ocw.uci.edu/courses/course.aspx?ID=35
CSET Science Subtest I: Forces and Motion - http://ocw.uci.edu/courses/course.aspx?ID=33
CSET Science Subtest I: Optics and Waves - http://ocw.uci.edu/courses/course.aspx?ID=32
See materials for you to borrow in the Student Resource Center, 1121 Berkeley Place in the Department of Education at UCI. Email for an appointment.
Review AP test prep guides, your college course materials, and search for particular topics online.
School textbooks may have online materials. Use current school textbooks.
Preparation courses and materials are available from Orange County Dept. of Education http://ite.ocde.us/test_prep.htm.
Review AP test preparation and your college course materials. Schools textbooks are useful, too.