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on slot
The short answer to your question is: in, or to give no preposition at all My history class is in slot 1 on slot SLOT meaning: 1 : a long, thin opening; 2 : a period of time that is available or used for a particular occurrence, event, etc

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on slot verb · to provide with a slot or slots; make a slot in · to place or fit into a slot: We've slotted his appointment for four o'clock