Semak Semula SPM 2016 - Need help

Hey peeps, SPM results were out a few days ago and I wasn't very pleased with some of my grades. I'm considering sending in one or two papers for re-marking.

Anyone of you have any experience with it before? What documents do I need to have my principal certify etc.? I've read the peraturan on the Lembaga Peperiksaan website, but I am still confused. Lol, any advice would be much appreciated. Thanks! :)

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