It seems its your choice for behavior(s). Is there more than one disruptive behavior (insubordination, procrastination, etc.) for each child or just one (e.g. insubordination)? Use "behavior" for one or "behaviors" for more than one.
The plural of "homework" is "homework." No "s."
I think a better adjective for "wild" would be "unruly." "Wild" usually refers to animals or people that are acting completely insane (i.e. when on drugs and completely out of control). "Unruly" is more often used for undisciplined kids like those in your example. But, if the situation is extreme, then "wild" can be perfectly appropriate.
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