Offering the California Achievement Test (C.A.T./5), specifically the C.A.T./5 Complete Battery and the C.A.T./5 Survey. They also offer TerraNova CTBS and TerraNova 2 (CAT/6) for homeschools, private schools, or organized groups. Test results are sent directly to you, helping you understand your student’s academic standing.

The Princeton Review offers personalized private tutoring, test prep, and admission products and services to help students knock down barriers and achieve their academic goals. Search for schools and careers, find test preparation courses, get information on scholarships, and more. Covered tests include: ACT, AP, PSAT, SAT, SAT Subjects, TOEFL, ISEE, MCAT, DAT, OAT, LSAT, GRE, GMAT, CFA, and USMLE.

Seton provides affordable, nationally standardized testing, including ability and achievement tests, practice tests, and test prep materials for homeschoolers, private schools, and home school groups. Testing services and materials are available for grades K-12. Tests include the Stanford 10 Online, CAT E-Survey, IOWA Form E, and TerraNova 2/CAT 6. Ordering is easy and you will get test results returned within two weeks. 

John Holt's article in which he lists questions that should be asked of school districts' testing policies.

When the first SAT was created, it was named the Scholastic Aptitude Test, signaling that its creators and the education world believed it to be a test of aptitude, or, a student’s ability to perform well in college. Aptitude tests supposedly measure talents that indicate possible achievement in the future, while achievement tests supposedly reveal how much someone has learned in the past. All these years later, we know the test never really did measure anybody’s aptitude to do well in college.

Established in 1955, National Merit Scholarship Corporation (NMSC) is an independent, not-for-profit organization that operates without government assistance. NMSC conducts the National Merit® Scholarship Program, an annual academic competition for recognition and college undergraduate scholarships.

The College Board is a not-for-profit membership association whose mission is to connect students to college success and opportunity. Founded in 1900, the association is composed of more than 4,700 schools, colleges, universities, and other educational organizations. Each year, the College Board serves over three and a half million students and their parents, 23,000 high schools, and 3,500 colleges through major programs and services in college admissions, guidance, assessment, financial aid, enrollment, and teaching and learning. Among its best-known programs are the SAT, the PSAT/NMSQT®, and the Advanced Placement Program®(AP).

Family Learning Organization offers standardized tests for homeschooling families. Through their Educational Assessment & Testing Service, tests may be obtained by parents to administer to their homeschooled children. Their services include standardized achievement tests (California Achievement Test, Fifth Edition), review of parent-administered assessments by a certified teacher, toll-free telephone answers to your questions about administering tests and interpreting results, and computerized score printouts for tests including Percentile Rankings, Grade Equivalencies, Stanine Scores and Scaled Scores, where applicable.

To help you in the critical task of selecting appropriate materials for your child, Christian Liberty Press has developed several specialized services for homeschoolers. They can test your child and also provide a customized curriculum recommendation that is suited for your child’s skill level.

Educational Testing Services (ETS) is an organization that provides a range of products and services, including research, test administration, test scoring, and more. This organization develops and administers AP, GRE, and SAT tests, among others.

Catforms Testing Service offers the 1970 California Achievement Tests with their own answer sheets and computer scoring. Key features of this system include graphical results in color, cumulative comparisons from year to year, and a detailed analysis of strengths and weaknesses in each area of the test. In addition to the original 1970 norms, they also have their own norms, the Catforms Percentiles, which are updated annually from the tests they have on file. The Catforms Percentiles are not a national norm, but are useful in comparing your students' performance with others from Christian schools and home schools today.

Trust Tutoring offers an Evaluation of Basic Skills, a standardized test of reading, writing, and math skills for ages 3-18.

Many parents arrive in the world of gifted education with a report full of tests results, supposedly defining their child as "gifted." But more often than not, parents have more questions than answers upon receiving those test results. And just as often, the short answers from the psychologist, the school, the teachers, and other parents do more to confuse than clarify.

The PASS Test was developed specifically for home schoolers. It has certain similarities to other achievement tests in that it estimates student achievement in the subjects of reading, language, and math. But is has important differences. It introduces four major improvements over most achievement tests presently available. First, it was designed for parents to administer at home. This can greatly reduce the stress level of testing. Second, it is untimed, which helps students to relax. Third, the student's approximate achievement level within his or her grade is initially identified by use of a brief accompanying placement test. This assigns each child to a test level where he or she is more likely to succeed, and it also allows for shorter tests. Finally, testing results show overall achievement as well as performance in each subject. The test is standardized and children's scores are compared with both national and home-schooling populations. This does not mean that the test is nationally normed, but that the scores are equated to those of public school students taking one of the nationally-normed tests. The states of Alaska, New York, and North Carolina have officially approved the PASS Test for purposes of state reporting. In other states which require testing, you should check with your local school district to make sure it meets their requirements.

As home schooling grows as a movement, there is increasing politics from anti-home school forces to try to interfere with or legislatively control home schoolers. This has come to include legislative attempts to force home school students to take standardized tests along with public school students. But mandatory testing doesn't work in public schools, and it won't work for home schoolers.