PLATO Learning, Inc. delivers just-in-time online assessments that are tied directly to state and provincial standards. Their courseware includes thousands of hours of basic to advanced level instructional content for K-adult learners. They provide web based assessments that assist in placement, progress monitoring, and accountability requirements with diagnostic and prescriptive tests, simulated high-stakes tests, lesson progress tests, standards-based tests, and cumulative tests.

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

Although this article has some outdated date information in it, it is a good discussion of the use of the PSAT/NMSQT (Preliminary Scholastic Aptitude Test and National Merit Scholarship Qualifying Test) for homeschoolers, especially those who are interested in qualifying for certain scholarships.

Piedmont Education Services offers the Iowa Tests of Basic Skills (ITBS) and the Woodcock-Johnson III Tests of Achievement (WJ-III), along with test prep materials.

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.

The Sycamore Tree, Inc. was incorporated in California in 1982, and provides homeschool educational services to students in grades K-12. This is a text-based homeschool computer program. They also provide testing services.

The National Center for Fair & Open Testing (FairTest) works to end the misuses and flaws of standardized testing and to ensure that evaluation of students, teachers and schools is fair, open, valid and educationally beneficial. They place special emphasis on eliminating the racial, class, gender, and cultural barriers to equal opportunity posed by standardized tests, and preventing their damage to the quality of education. Based on Goals and Principles, they provide information, technical assistance and advocacy on a broad range of testing concerns, focusing on three areas: K-12, university admissions, and employment tests. FairTest publishes a quarterly newsletter, The Examiner, plus a full catalog of materials on both K- 12 and university testing to aid teachers, administrators, students, parents and researchers. They also have numerous fact sheets available on standardized testing and alternative assessment.

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.

Offers the Iowa Tests of Basic Skills (ITBS), the Stanford Achievement Test, the Cognitive Abilities Test (CogAT), and the Otis-Lennon School Ability Test (OLSAT). There are some specific guidelines for administering these tests, including requirements in some cases for a bachelor's degree, teacher certification, and/or special training in test administration. Also offered are test support products designed to help your child achieve higher test scores.

Discuss testing with other members and with a 25-year homeschool veteran mom who has become a certificated Washington state teacher & administrator, and registered counselor.

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

Future School online learning systems support your entire family in both the classroom and the home using only qualified teachers to ensure its educational services. They offer tutoring students in the home, classroom and after school facilities, providing both face-to-face, telephone and online assistance in the two core areas of literacy and numeracy. Future School has also many years experience in the development of Basic Skill Tests in mathematics and English covering years 3, 5, and 7, including the materials, delivery, marking, psychometrics and reporting to Education Departments, schools, and parents.

Offers BRIGANCE Screening and Inventories products. Designed for use in elementary and middle schools, the CIBS-R is a valuable resource for programs serving students with special needs, and continues to be indispensable in IEP development and program planning.

Bayside School Services offers do-it-yourself standardized achievement tests, available all year. Bayside gives you original publisher materials plus genuine CTB scoring reports, including free practice tests for all grades where available. Test prices include shipping, handling, scoring and all practice tests. Special pricing available for group orders.

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.

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. 

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.