What to do when recipe is high heat but pan keeps over boiling?

I don't know what to do other than to keep taking it off the heat or lower the temperature but it means I cannot follow recipes properly. Why do the back of packets such as beans, rice, potatoes etc all say to boil for X amount of time on X amount of heat if it means your pan will overboil? It means I have to... show more I don't know what to do other than to keep taking it off the heat or lower the temperature but it means I cannot follow recipes properly.

Why do the back of packets such as beans, rice, potatoes etc all say to boil for X amount of time on X amount of heat if it means your pan will overboil?

It means I have to cook for longer?
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