The workflow
Set the total number of questions, count the wrong answers on a paper, and read the corresponding score. The correct count is total questions minus wrong answers.
Why a chart helps
When every paper has the same number of questions, the teacher can reuse one score chart for the whole stack. That removes repeated percentage calculations.
Where the Easy Grader fits
Use Easy Grader for repetitive grading. Use the Test Grade Calculator when you only need to calculate one assessment score.