great reply already, the problem you may encounter is how the majority of risks have already been minimised, or indeed how safe the room already feels. Check what doorstops are in place, is there a door monitor system - someone holds the door open whilst a line of children leaves the room: preventing squashed fingers/bumped head, enabling a count, ensuring room is empty and aside from risk promoting consideration
, check where your fire exit is, where the extinguisher, first aid or cleaning materials are, if storage cupboards are stacked with resources do they need continual checking to prevent toppling. You could also ask if the room has its own assessment in place that you may find compliments what you notice about the areas.
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