Closed-book C# exam written by ChatGPT and Claude leaves author scoring 22-54%

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A developer who relies heavily on AI coding tools tested his own C# knowledge by taking two closed-book exams, one generated by ChatGPT and one by Claude Sonnet 5.5, with no AI, search, or autocomplete. He scored 53.5% on the ChatGPT exam and about 22-23% on the harder Claude exam, with modern C# being his weakest area on both. He attributes the results partly to never having truly learned newer language features rather than solely to forgetting them, since accepting generated code without studying it leaves little absorbed. The exams covered language knowledge only, excluding frameworks like ASP.NET or Blazor. He shared sample questions on value versus reference types, nullable reference types, and newer syntax as examples of what he is now relearning.

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