Recalculate Scores After Answer-Key Changes

Recalculate student results against original and revised answer keys and save every item-level contribution to the score change.

Features

• Compare single answers or unordered sets against explicitly accepted alternatives.
• Apply declared item weights, invalid-item credit and missing-response policies.
• Retain old and revised totals with the selected percentage precision.
• Save revised-grades.csv and score-changes.csv so total differences can be traced to questions.