How to Calculate if it's Mathematically Impossible to Pass the Final Exam

The Point of No Return

It is the week before Finals. You have a 58% in your Honors English class.

You tell yourself: "If I just study for 40 hours and get an A+ on the final exam, I can pull my grade up to a C and pass the class!"

You lock yourself in your room and study frantically for three days. You take the final exam, score a miraculous 95%, and wait for your final grade to update. Your final grade is a 64% (D). You still failed.

You didn't realize that passing was mathematically impossible before you even picked up your textbook.

The Illusion of the Final Exam

Many high school students over-estimate the weight of the Final Exam. In a standard high school class, the Final Exam is usually worth 15% to 20% of your total semester grade.

Let's do the math on the 58% scenario:

Your current grade (80% weight) = 58% x 0.80 = 46.4 points.

To pass (70%), you need 70 total points.

70 - 46.4 = 23.6 points needed from the Final.

Since the final is worth 20%, you need 23.6 / 0.20 = 118% on the Final Exam.

Because the maximum score on the final is a 100%, it is physically, mathematically impossible for you to pass the class.

Why You Must Run the Math Early

If you had run these numbers through a Grade Calculator a week earlier, you would have realized you needed a 118%.

Knowing it was impossible to pass English, you could have completely stopped studying for it. You could have taken that 40 hours of study time and applied it to your Math or History finals, ensuring you secured 'A's in those classes.

Instead, by blindly studying for a doomed class, you robbed Peter to pay Paul, and likely dragged down your GPAs in your other subjects as well.

The Rule: Never start studying for Finals Week until you have run every single class through a calculator to find the exact target score required to hit your letter-grade threshold.