Suggest that your parents sit down and help you with homework. If you are struggling to understand your work, ask your parents if it is possible to get a tutor. If you aren’t sure how to improve, ask your parents what they suggest. Keeping your parents involved will likely make them more understanding if you get any more bad grades in the future. Tell them about anything that is inhibiting your education. Don’t be afraid to tell them everything. Tell them about bullies, distractions, or trouble concentrating. Your parents are there to help you.  Something you could say is, “There is an ongoing distraction at school (or home), that prevents me from concentrating on my studies.” Tell your teacher if there is an ongoing distraction or bully in your class. There are many bad habits that lead to low grades. Avoiding these habits in the future will help you do better in your studies, therefore preventing stressful confrontations with your parents. Some of these bad habits are:  Copying a classmate’s homework instead of doing your own work. Not asking questions when you don’t understand the material. Cheating on quizzes and exams. Forgetting the due dates of essays, projects, quizzes, tests, etc. Keep a calendar for the due dates of your schoolwork. Failing to take notes during class. Taking notes during class will help you avoid zoning out and not paying attention.

TL;DR in Indonesian:
Mintalah bantuan orang tua. Jelaskan semua masalah yang kamu hadapi kepada mereka. Hindari kebiasaan buruk di masa depan.