Tips—Dealing with Period at school??

It’s regular for me to have a heavy period. It runs in my family… ‘nough said.
School lasts 8 hrs 40 minutes. 8:55 am-3:35 pm. Lunch is at 11:06. Only allowed to go and use the restroom 3 times daily.
I was just wondering what you all might have in mind. You may have thought of something I haven’t though of. That’s why I’m not saying what I usually do (that and the fact it always blows up into a catastrophe).
What would you do or have done? Please and Thnx!

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