Posted by rfvv on Monday, March 26, 2012 at 12:59am.
"It" is just one of those generic uses that doesn't refer to any particular noun. This construction also occurs in these:
It's very hot today.
It's raining cats and dogs outside.
It's a great day for a picnic.
Yes, "to school" is an adverbial use of the infinitive in this sentence.
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