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

Although this article has some outdated date information in it, it is a good discussion of the use of the PSAT/NMSQT (Preliminary Scholastic Aptitude Test and National Merit Scholarship Qualifying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.

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. 

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.

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.

Assessment is authentic when we directly examine student performance on worthy intellectual tasks. Traditional assessment, by contract, relies on indirect or proxy 'items'--efficient, simplistic substitutes from which we think valid inferences can be made about the student's performance at those valued challenges.

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.

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.

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.

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

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.

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.

Colleges will accept either the SAT or ACT. So which should you take? It's all about the numbers. Some students end up scoring substantially higher on the SAT; others do better on the ACT. The Princeton Review Assessment (PRA) is designed to help you determine which test is better fit with your abilities.

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).

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.