I don't know if these are helpful, but I googled "resonance hybrids practice" and these are some sites that came up:
misterguch.brinkster.net/PRA037.pdf
http://chemwiki.ucdavis.edu/Theoretical_Chemistry/Chemical_Bonding/Resonance#Practice_Problems (practice problems at bottom of page)
http://mmrc.caltech.edu/chem1a/Wk%205%20Lewis%20VSEPR/Lewis%20Dot%20Structures.pdf
Hope this helps. They all come with solutions.
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