Think you can ace an intelligence test? Read up on some of the most challenging standardized intelligence tests, The Stanford-Binet Intelligence Scale: Fifth Edition(SB5) and the Wechsler Adult Intelligence Scale, Fourth Edition(WAIS-IV).

Stanford-Binet Intelligence Test

Modeled on the first test of baseline intelligence which was commissioned by the French government around 1905, the SB5 has been revised five times since, and now is individually administered to anyone two through eighty-five plus years of age. For every verbal subtest on the SB5, there is a non-verbal test that corresponds with each of the five intelligence factors on the scale: fluid reasoning, quantitative reasoning, visual-spatial processing, knowledge and working memory. The non-verbal subtests, in which one can give answers by pointing to or manipulating objects, are designed to give non-English speakers a fair chance. An IQ range of 145-160 is labeled "very gifted; highly advanced." A free Stanford-Binet practice test can be taken online at

Wechsler Intelligence Test

Although the WAIS-IV was developed for test-takers aged sixteen to ninety years, one can access Pearson Clinical and see that variation tests can be purchased for children aged six to sixteen (WISC), for preschoolers (WPPSI) and for those who want to quickly estimate verbal, performance, and full IQ. The Wechsler Intelligence Test is made up of ten subtests that give four index scores that represent what The Wechsler calls the main parts of intelligence: verbal comprehension, perceptual reasoning, working memory and processing speed. The WAIS-IV gives, in addition to IQ, a General Ability Index score. The GAI measures cognitive strengths less likely to be compromised by memory impairments. A free online Wechsler Test can be taken at

Other Intelligence Testing

One-hundred, free intelligence-testing questions can be found at, a site that promises over 35,000 practice examples for children and teens who want to get into gifted/talented programs and private schools. The website offers 30 intelligence-test questions to be answered within 30 minutes. They consist of finding "missing pieces" and of manipulating pieces within two-and-three-dimensional objects. Or, one can test his overall intelligence by accessing Free-IQTest and responding to 20 brain-teasers, which include abstract reasoning and advanced algebra. For those planning on enlisting in the armed forces, all 9 sections of the ASVAB Military Test can be taken online, for free, at