Here's how to figure it out:
* Weighting of the test: What percentage of the final grade is the test worth? (e.g., 20%, 30%, 40%)
* Current grade (A-): What is the numerical equivalent of an A- in your class? This varies by school/teacher, but it's typically in the 90-93% range.
* Grade on the test (C): What numerical grade did you receive on the test? This is usually in the 70-79% range.
Example:
Let's say the test is worth 30% of the final grade, your current grade is a 92%, and you got a 75% on the test.
1. Weighted current grade: 92% * 0.70 (70% of the grade remaining) = 64.4%
2. Weighted test grade: 75% * 0.30 = 22.5%
3. Final grade: 64.4% + 22.5% = 86.9%
In this example, a C on a 30% weighted test would bring a 92% down to an 86.9%, which is likely a B.
You need to know the specifics of your class to calculate the impact. Use the same formula, substituting your actual values.