Is it necessarily "Unterricht," and not "Klasse"?
Yes, absolutely. Klasse, unlike in English, only refers to the group of children itself. But why is there a capital 'A' in also?
Thanks. As for the capital A--that's a typo. My guess is they originally phrased the sentence to begin with "Also," changed their minds, recast, but didn't clean up after themselves. ;-)
Can 'ist' be used here?