How do I convince my dad?

Apulu_3
So yeah I'm in high school now (9th grade). And as it is a pretty serious period I take all my books (that are mentioned in time table) and the required notebooks. We have like 3 books for maths, 3 for English, 3 for 2nd language and so on. I take all of them. My dad says that I shouldn't take much books because my bag becomes very heavy. For me, no it isn't very heavy now at all. I don't want to get embarrassed in class or partially understand a class only because I didn't had the requirements that is why I take everything with me. I know he worries about me and I truly appreciate that but now that I'm grown up I don't feel uncomfortable handling that bag. It will take 1 week to arrange all the things in locker as I'm taking books according to the schedule not all at a time. So how do I convince my dad to let me take the books I want to?
How do I convince my dad?
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