1. No, way too short and your whole back would be showing. 2. No, too short and your back would be showing. You might be able to wear it with a cardigan and tights and have it be fine though. 3. I think it could work. The slit shows less leg then shorts or a shorter skirt/dress would. 4. I think it is too short, but if you wore tights it would be fine. Or shorts under it, but not sure how that would work, 5.Same as 4. 6.Sane as 4 and 5. 7. They are too short to me, but it other girls get away with wearing them then I guess you could. 8. Fine but you would need a cardigan with it. 9. It should be fine with a cardigan. 10. That seems fine.
Talking about HS?, well honestly all except (2) of them don't seem too appropriate for school. If you were my daughter and we were out with the family somewhere casual...most of them would be fine. Like everyone said, depends on the HS. I mean I went to school in Texas and a SoCal beach community. TOTALLY different levels of prudishness lol. #1 looks like something I've seen girls wear at the beach or the club on the weekend. Wear that once you move out of the house for your parents sake.
Eh, I don't know what your dress code is for your school but if it were the high school I went to, pretty much none of that would be acceptable. No open back shirts/dresses, no spaghetti straps, no skirts above your arms length, no low cut shirts, etc.