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CLEP practice questions - frequently asked questions

Plain answers about how CLEP Exam Prep works: the exam, the questions, pricing, the free trial, and what you actually get.

No - and you should be wary of any site claiming otherwise. Every question here is original, written to mirror the style, difficulty, and judgment the real CLEP exam tests. Each one comes with a plain-language explanation of why the right answer is right and the others aren't.

The CLEP exam spans 11 domains: Language of Light and Lighting Efficiency (8-12%); Lighting Quantity and Quality Fundamentals (8-12%); Color, Visibility, and Health (8-12%); Traditional Light Source Lamps and Ballasts and their Operating Characteristics (4-6%); LED Technology and its Operating Characteristics (8-12%); Lighting Maintenance and Environmental Safety (4-6%); Lighting Controls (8-12%); Lighting Audits (4-6%); Lighting Photometrics, Reports, and IES Files (8-12%); Lighting Calculations (12-18%); Financial Analysis Metrics and Calculations (8-12%). Every practice question on this site is tagged to one of these domains.

The CLEP exam has 120 questions and is completed in 4 hours. Our timed practice mirrors that length and pacing, so exam day feels familiar.

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