Explanation:
Achievement tests say "You scored 40%." Diagnostic tests ask "Why did you miss the other 60%?"

Detailed Topic Insight (Diagnostic Testing):
The distinction between assessment types is crucial for remediation.

Achievement Test: Summative. Focuses on content coverage. Example: Final Exam. Result: "Pass/Fail". Use: Promotion.
Diagnostic Test: Formative/Analytic. Focuses on specific skills. Example: A test only on 'Prepositions' to see which ones are confusing. Result: "Student confuses 'in' and 'at'". Use: Planning Remediation.

A diagnostic test analyzes errors patterns. For example, if a student writes "walked" as "walkd", "played" as "playd", the diagnostic conclusion is "The student understands the concept of past tense but struggles with the spelling rule of -ed suffixes." Remediation will focus on spelling, not the tense concept.

Remedial Teaching

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