The Courseiva Difficulty Index

How the index is calculated

Each exam's score blends five measurable signals from Courseiva's question bank and learner data:

• Question difficulty mix— the share of easy, medium, and hard questions in the exam's blueprint-aligned bank (weighted 0.15 / 0.5 / 0.85).
• Exam-trap density — how many questions carry a documented trap or common mistake, a proxy for how deliberately the exam misleads.
• Domain breadth — the number of official exam domains; broader blueprints demand more study surface.
• Time pressure — the average estimated seconds per question relative to a 2-minute ceiling.
• Learner accuracy — real first-answer correct rates from Courseiva practice sessions. Only included once an exam passes a minimum sample of 100 answers, at which point it contributes 30% of the score.

Scores map to four bands: Foundational (below 40), Moderate (40–54), Challenging (55–69), and Advanced (70+). The index is recomputed as the question bank and learner sample grow, so scores shift slightly over time — that is by design.

Companion metrics — how each is measured

Each exam's Exam Intelligence panel shows additional named metrics alongside the Difficulty Index. All are computed the same way for every exam.