Nationally normed achievement tests for homeschoolers are standardized exams that measure a child’s reading, math, and language skills against a representative national sample of students at the same grade level. Instead of testing whether a student mastered a particular textbook, these tests return percentile rankings, grade-equivalent scores, and other national comparisons that show where a homeschooled child stands relative to peers across the country. About 13 states require homeschooling families to submit this kind of test result on a regular schedule, and families in states without a mandate often use the same tests to catch curriculum gaps and document growth.
When These Tests Are Required
Roughly 13 states require homeschoolers to submit some form of standardized assessment to the local school district or state education agency. The schedule depends on the state: some require testing every year, some every other year, some every three years, and some only at specific grade levels. Families who skip required testing risk being found out of compliance with their state’s homeschool law, which can trigger consequences ranging from a warning letter to a mandate to enroll the child in public school.
Compliance isn’t the only reason to test. When a parent both teaches and grades, full objectivity is nearly impossible. A nationally normed test removes that bias by comparing the child’s work against thousands of other students who took the same exam under the same conditions. If a child scores well in reading but drops in math computation, that signals a curriculum adjustment before the gap widens. Many families also keep score reports for college admissions portfolios, scholarship applications, or documentation when a child re-enters a public or private school.
The Main Tests Homeschoolers Use
Not every standardized test is sold directly to homeschool families, and some require a credentialed professional to administer. The options below are the ones most commonly chosen by homeschoolers, and they differ in format, subjects covered, and how flexible they are to administer at home.
California Achievement Test (CAT)
The CAT is the most accessible option. It comes in paper and online formats with timed and untimed versions, covers reading, language mechanics, and mathematics, and most testing services let a parent proctor it at home with no special credentials. For families in states that simply require “a nationally normed test” without naming one, the CAT is the common default.
Iowa Assessments
The Iowa Assessments cover more subjects than most achievement tests. In addition to reading, language, math, vocabulary, and spelling, the upper-level forms include science and social studies subtests.1Riverside Insights. Iowa Assessments Test Descriptions The test is timed, and proctor rules are stricter than the CAT, so most families arrange for an outside administrator.
Stanford Achievement Test (SAT-10)
The SAT-10 is untimed, which makes it a strong choice for students who struggle under time pressure. Pearson, the publisher, offers practice tests to familiarize students with the format in advance. It covers reading, math, language, science, and social studies, with a social science subtest that emphasizes critical thinking. Pearson does not sell the SAT-10 directly to homeschool families; orders go through authorized resellers such as Seton Testing Services, BJU Press, and Brewer Testing Services.2Pearson Assessments. Stanford Achievement Test Series Tenth Edition
TerraNova
The TerraNova is a multiple-choice, bubble-sheet test covering reading, language arts, math, science, social studies, vocabulary, and spelling. Testing runs roughly two to five and a half hours across multiple sessions. It is available for purchase by homeschool families and private schools.
Woodcock-Johnson IV
The Woodcock-Johnson IV works differently from the others. It is individually administered one-on-one, with the examiner guiding the student through subtests covering cognitive abilities, academic achievement, and oral language.3Riverside Insights. Woodcock-Johnson IV The result is a detailed profile of specific strengths and weaknesses rather than broad subject scores. The trade-off: it requires a Level C qualified examiner, typically a licensed psychologist or someone with doctoral-level training.4WPS. Woodcock-Johnson IV Parents cannot administer it, and the professional fee makes it significantly more expensive than the other options.
NWEA MAP Growth
MAP Growth is computer-adaptive, meaning each question’s difficulty adjusts based on the student’s previous answers. It is widely used in public schools, and homeschool families can access it through services like Homeschool Boss.5NWEA. Family Toolkit Because it adapts in real time, MAP Growth can pinpoint a student’s working level even when it sits well above or below the enrolled grade. Not every state accepts MAP Growth for homeschool compliance, so confirm your state’s approved test list before choosing it.
Who Can Proctor
The rules on who may administer the test are set by the publisher, and they vary more than most families expect.
- CAT: most testing services allow a parent or guardian to proctor without special credentials.
- Iowa Assessments: the publisher prefers administrators with at least a bachelor’s degree, though some authorized services accept alternative qualifications such as teaching experience.
- SAT-10: proctor rules are set by the authorized reseller, but a bachelor’s degree or teaching certification is common.
- Woodcock-Johnson IV: only a Level C qualified professional, in practice a licensed psychologist, school psychologist, or someone with equivalent doctoral-level training.4WPS. Woodcock-Johnson IV
If you need a proctor, start with the testing service you’re ordering from. Many homeschool co-ops organize group testing sessions with an approved administrator, which also brings down the per-family cost. A teacher friend or retired educator can serve as proctor as long as the person meets the publisher’s stated requirements.
What They Cost
Most paper or online achievement tests for homeschoolers run between $25 and $55 per student. The CAT sits at the lower end; the Iowa Assessments and SAT-10 fall in the middle. Prices vary by testing service and by whether you order a core battery (main subjects only) or a complete battery (adding science, social studies, and other subtests).
The test fee is only part of the total. If your test requires a qualified proctor and you can’t serve, expect to pay $50 to $100 or more for a professional administrator. The Woodcock-Johnson IV is in a different cost tier because the Level C requirement means paying a psychologist or educational specialist, and that can run several hundred dollars for a full evaluation. Budget for test materials, proctor fees, and shipping on any paper-based answer sheets.
Picking the Right Norming Period
When you order, you’ll be asked to choose a norming period. This is the single most consequential ordering decision, and families get it wrong often enough to be worth flagging. Standardized tests divide the school year into three windows: fall (roughly August through November), midyear (December through February), and spring (March through June). The norming period tells the scoring system how much instruction a typical student at that grade level would have received by test day. If you test in April but select the fall norming period by mistake, the algorithm compares your child against students who had only a few months of instruction instead of nearly a full year. Scores come back artificially high and tell you nothing useful. Match the norming period to when the student actually takes the test.
You’ll also need the student’s full name, date of birth, current grade level (the grade they are completing, not the one they are about to enter), and planned testing dates. During spring testing season, processing and shipping times stretch, so order early enough to clear your state’s submission deadline.
Reading the Score Report
The report returns several different numbers. Three matter most for homeschooling families.
National Percentile Rank
The National Percentile Rank (NPR) tells you the percentage of students in the norm group who scored at or below your child’s level. An NPR of 75 means your child outperformed 75 percent of the comparison group. This is not the same as answering 75 percent of questions correctly. A student could answer 60 percent of questions right and still land at the 85th percentile if the test was difficult enough that most students answered fewer. For understanding where your child stands nationally, the percentile rank is the most useful number on the report.
Grade Equivalent
Grade Equivalent (GE) is the most commonly misread score on the report. A GE of 6.2 for a fourth-grader means the child scored as well as a typical student in the second month of sixth grade would score on that same fourth-grade test. It does not mean the child has mastered sixth-grade material or is ready for sixth-grade work. A high GE is encouraging but should not drive grade-skipping or curriculum advancement, and a low GE does not mean a child belongs in a lower grade. Use the percentile rank for the more reliable picture.
Stanine
Stanine scores (short for “standard nine”) compress results onto a 1-to-9 scale. Scores of 1, 2, or 3 are below average; 4, 5, or 6 are average, where most students land; 7, 8, or 9 are above average. Stanines are useful for a quick overview but aren’t precise enough to track small year-over-year changes. A student who moves from the 55th to the 65th percentile may show no stanine change at all because both fall in the same band.
Accommodations for Students With Disabilities
Students with documented disabilities are generally entitled to testing accommodations. Common modifications include extended time, untimed rest breaks, large-print booklets, screen magnification, and the use of a reader or sign language interpreter. The specific accommodations available depend on the test publisher and the testing service you order through.
To request accommodations, you’ll need documentation of the disability, typically a current psychoeducational evaluation or a report from a licensed professional describing the condition and the modifications needed. Contact the testing service before you order so arrangements can be made in advance; late requests may not be processed in time for your testing window. An untimed test like the SAT-10 may already resolve the time-pressure issue without a formal request, but other modifications such as large print or a separate testing space still need to be arranged ahead of time.