Welcome to the Cow Audio Forum, Don.
Mr. Fishback has some excellent advice. If you can arrange to desks to make the distance to the students more equidistant AND closer together, your audio job will be easier.
I don't understand "pin jack." Perhaps if you give us a link to which camera you're talking we can help you better. Six in front, six in back and you should be able to cover it with two shotguns.
While having two boom operators would result in the best audio, your fall back position would be to lock down two mics, each pulled back a bit to get half of the students and split each mic to a different channel. I'd prefer hypers like the Schoeps cmc641, but you probably can't afford them. The Audio Technica 4053a is a good one.
Regards,
Ty Ford
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