Is it a sin to get bad grades?

It depends on why you received the bad grades.

Grades are important because they help teachers and parents know whether you're learning. Bad grades don’t make a person worse than another person, and they aren’t necessarily a sin. They are simply a way to know whether you understand what you’re learning. If you have bad grades, think about what is causing them. Are you listening in class? Are you doing your homework? Do you understand the subject?

Bad grades are sometimes a result of sin. If you are messing around in class or not respecting your teacher, then that is sin. But sometimes bad grades are simply a way to know you must work harder to understand the material or find someone to help you understand. If you try hard but still get low grades, then it’s important to ask someone to help you.

God created us all differently. Maybe you find certain school subjects harder than others. Some people do better in subjects like reading and other students get better grades in math or science. Grades are a good way to track your progress and find out where you need to work harder.

Pray and ask God to help you in school. James 1:5 says, "If any of you need wisdom, ask God for it. He will give it to you. God gives freely to everyone. He doesn’t find fault." God cares about you and He can help you do your best in school.