I am a 15-year-old boy from Turkey .I will send an application via the common app.My question is my school doesn’t isnt graded as the same as American system.How can I send my grades to them
You don’t send your grades. An administrator form the school sends them. If they are unable to send electronically, they can send by regular mail.
Your grades are listed on your transcript, which are then sent by a high school official. An explanation of the grading system may be part of the transcript, usually is, if it is very different from the American system.
Good luck!