Unless it speciallises as a language school, you probably won't be able to do itailian, especially at AS/A-level.
Don't forget for your first year at sixth form you can only choose 4-5 subjects, and you do get frees, but apparently the workload is a lot.
If English is not your native language and you want to do it as an AS, then I'm sure that you'd get suppport or if you just need the occasional meeting I'm sure your tutor will have an "open door" policy.
Also you'll find the class sizes are a lot smaller than in America, them being around 17-ish, but if it's a popular subject (which will depend on the school-for mine it's law, as it's one of the few in the area that does an A-level Law course) then it may be slightly bigger to around 25 students. (for my german there's only goona be about 7 of us, cos there's only one class in my year, and most aren't taking it for an A-level.)
so I have a pretty good english
"So I speak(you could say "have" as well) pretty good english"
But honestly, you do. I didn't know your first language wasn't English, well done! XD
Also in England we use metric/Imperial measures*, celcius for temperature, and some spellings are slightly different (eg: US=mom, UK=mum/mam (scottish))
*we still use mph# and stones (weight measure), some people especially older people still use imperial for everything. we don't use quarts or fl oz, we only use pints really. (beer can only be sold in pints!)
#because it'd cost too much too change all the signs to km/h!!
