On dropping out at age 16, I know that is definitely not kosher in Texas (at least under normal circumstances--I'm sure if you're emancipated or something it's different). The rule is, you stay in school until you either graduate or reach age 18. Per example, most of my friends were 18, didn't drop out, graduated, so on so forth la dee da. I'm graduated and going to be a college freshman at 17, which is kosher because I got a diploma. So I guess it varies from state to state, as most bastardized U.S. laws are.
Same sex education seems silly to me in most cases, not because I think having both sexes together is distracting but having them apart seems even more volatile. At least when you have some sort of sexual balance in the school, you don't have guys punching each others' brains out and girls scratching each others' eyes out. From having mostly girl friends and having to sit through most of the insufferable drama that occurs spontaneously amongst girls, I cannot imagine having to go to a single-sex school. Oh, and to reply to werepossum's thought, yes, guys are more distracted by girls' boobies than girls are about getting guys' pants off.
Have some sympathy for the public school teachers. I didn't like most of my teachers just because they were people and I don't like most people, and I was able to distinguish this usual contempt from the thriving, bursting contempt which I felt for administrators. Administrators screwed over me and my friends all throughout public school, and this is the main difference between public and private schools because administrators' positions in public schools aren't so easily threatened by unhappy parents and children. So, teachers are love, and administrators are (usually) bile. Now, if you're one of the few and far between good administrators out there, come out of the woodworks so I can give you a pat on the back.
And don't even get me started on liberal arts. I'm going to go to a liberal arts school and people that use liberal arts majors to get through with college so they can get paid drive me insane.