Difficulty weighting
Questions contribute differently based on calibrated difficulty and discrimination.
Scoring and form design
How this free online reasoning test scores your session
Cerebrum IQ does not treat every question as identical. The current scoring model uses item difficulty, answer accuracy, response timing, and coverage quality to produce a standardized reasoning estimate and an uncertainty interval.
How forms are built
Each live session draws 20 questions from a larger bank. The form builder keeps domain coverage balanced so one attempt is not overloaded with only one kind of reasoning problem. Answer options are also shuffled to reduce pattern memorization.
- Four questions per domain in the live session.
- Questions sampled across difficulty bands.
- Session-level form ID for analysis and calibration.
How the score is estimated
The current model is closer to a standardized reasoning estimate than a raw quiz percentage. It adjusts for item difficulty and incorporates guessing correction so harder questions do not count exactly the same as the easiest ones.
Response quality
Very rushed answers and incomplete coverage affect reliability and interpretation.
Score interval
Results include uncertainty so users do not overread a single point estimate.
Domain profile
Pattern, verbal, logic, quantitative, and spatial results are reported separately.