liaozhe789 / cram-engine Star 0 Code Issues Pull requests AI exam cram engine for Codex. SM-2 spaced repetition + knowledge graph + 4-stage closed loop: diagnose, teach with Feynman method, multi-mode test, targeted remediate. Ingests past exams, textbooks, lecture notes. Bilingual (Chinese/English). Per-topic weakness analysis with must-know priority weighting. spaced-repetition knowledge-graph codex exam-prep ai-education learning-tool sm2-algorithm cram-engine Updated Jun 25, 2026 Python