SQL and Data Wrangling

Format

Hands-on: mcq, spot, text tasks. No trivia — you do real tasks.

Domains

SQL · Wrangling

Duration

about 20 minutes

Levels examinable

L1–L5

AI policy

AI-free

Scoring

Correctness first; efficiency (time, keystrokes, steps vs an expert reference) adds a bounded bonus. Graders check outcomes, so any valid approach passes.

Credential

Module badge, valid 24 months. $29 per certification attempt; practice is free.

• L1Foundation. SELECT and WHERE
• L2Proficient. Between Foundation and Advanced
• L3Advanced. Joins, GROUP BY, window basics
• L4Expert. Between Advanced and Master
• L5Master. Complex analysis at speed

• Standard mode (L1–L3 on your public certificate): email verification, focus/tab detection, keystroke timing telemetry, randomized parameterized tasks, server-side timer.
• Proctored mode (required for public L4–L5): government ID and selfie check, webcam snapshots and optional screen share, reviewed only if a session is flagged. Recordings are deleted after 90 days.
• Unproctored results are capped at L3 on the public certificate; you can book a proctored retake to confirm L4 or L5. Every certificate shows whether it was proctored.
• Retakes: wait 14 days per module, maximum 3 attempts per quarter. Your highest valid level shows on your profile.
• We never show raw keystrokes or video to employers. You own your results. Data notice

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• Data Analyst · 9.1%