How are OMR used to help grade test papers?

Optical Mark Recognition (OMR) technology is used to automate the grading of test papers by scanning answer sheets that have been filled in by students. These sheets typically contain predefined answer bubbles that students mark for their responses. The OMR software detects these marks, compares them against an answer key, and calculates scores based on the correct responses. This process significantly reduces grading time and minimizes human error, allowing for efficient assessment of large volumes of test papers.