Educational practice, clearly explained

Practice reasoning. Learn from the result.

Q: Where should I begin?

Start with the free Original Reasoning Test for a short multi-skill challenge, choose AGCT for a long historical practice format, or use Big Five for a personality self-report.

Q: Do these assessments provide a clinical diagnosis?

No. Cognitive Index provides educational practice and self-guided performance summaries. It does not replace an assessment administered and interpreted by a qualified professional.

Q: Why might my results change between attempts?

Timing, sleep, interruptions, device differences, familiarity with the task, and ordinary measurement error can all affect performance. Treat small score changes cautiously.

Q: Can I compare scores from different formats directly?

Usually not. Assessments differ in content, length, timing, scoring, and reference data. Compare the skills and conditions described on each result page before comparing numbers.

Q: Where can I learn how scores are interpreted?

The Cognitive Index learning library includes guides to percentiles, confidence intervals, online testing limits, and common scoring terminology.

Take a free original IQ-style reasoning test, explore a public-domain personality profile, and learn how to interpret online assessment results responsibly.

Take the free reasoning test Compare all formats

Choose by purpose

Three different ways to explore performance

Each experience has its own format and interpretation. Review the details before deciding which one fits your goal.

Free original IQ-style test

Original Reasoning Test

A balanced public test with original pattern, quantitative, logical, verbal, and spatial problems plus explanations for every item.

25 questions25-minute limit

Take the free test

Historical test practice

AGCT Practice Form

A long-form practice experience inspired by the public historical format, covering vocabulary, quantitative, and spatial reasoning.

150 questions40-minute limit

Review AGCT practice

Personality profile

Big Five Personality Test

A public-domain IPIP-NEO-120 self-report experience covering five broad personality domains and 30 narrower facets.

120 statementsAbout 15–20 minutes

View the Big Five profile

Read every result in context

Online scores are snapshots of performance under particular conditions. They are most useful when you understand the format, scoring method, and limits behind them.

Browse interpretation guides

Practice, not diagnosis

These experiences are educational tools and do not replace a professionally administered psychological evaluation.

Formats are not interchangeable

Question types, time limits, and scoring models differ, so numbers from separate assessments may not be directly comparable.

Conditions affect performance

Fatigue, interruptions, device setup, and familiarity can influence an individual attempt.

Learn before you compare

The learning library explains common assessment terms, what online scores can support, and where interpretation should remain cautious.

Before you begin

Practical questions

A few points to help you choose a format and interpret the experience appropriately.