If they are more sophisticated, then they will apply logic. They will ask your school to send them the typical grades and course offerings of the top most students. Your child will be compared to that rubric since schools have different offerings and vary in strictness of grading.
Your school’s 3.75 GPA student may be viewed extremely highly if the top students are getting 3.78 whereas another school’s 3.85 GPA student won’t look so great if there are dozens of 4.0 students. Hope this makes sense. Good luck to your child