You can't.
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I don't think so. There aren't many seizure inducing features of Minecraft. Creepers, when about to explode, flash white a few times. Also while healing, your health bar flashes white, which is rapidly increased after drinking a certain potion. But I don't think those are very dangerous to those prone to seizures.
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You can email Minecraft if you have any questions about Minecraft. That's what the Minecraft Help Email is.
There are no schools in Minecraft and/or a school that teaches minecraft.
To get Minecraft for free, you need to download it on Xbox.