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CBS stands for CPI Booster Score, a metric used to evaluate how effectively a course improves CPI. Courses with a CBS above 3.5 are considered "safe grading courses." This score is calculated using data from the past four years, excluding the academic year 2024-25 — more details can be found in the CBS documentation.
The median course has a CBS of 3.09. For example, here are some well-known courses with their CBS values:
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