First of all, i'm rude but i have to say that your English level isn't that good, yet you can replace it with IELTS/TOEFL (to be honest it's a must for you to take IELTS/TOEFL)
now let me answer your question:
1.
500-600k <-- for the whole academic course or just for 1 year?
if it's for like 4-5 years of study, please go to Canada
if it's for 1 year only, you can go everywhere -.-
University: US Community Colleges (go for agents, they have LOADS for you to choose from) some of them also organize English supplementary courses for students whose language level hasn't reached their requirement
you can study the first two years of Bachelor degree, which is general studies-same in all universities, then you can transfer to Year 3 in some prestigious universities eg. John hopkins/princeton/washington station/washinton etc.
Foundation: UK: bellerbys, kings, International study centre, INTO, kaplan, foundationcampus, navitas and some universities who organize foundation course themselves
Australia: navitas and some others i forgot (sorry ._.)
you study year 0, and then gain 60-70% in the course, then you are guaranteed a bachelor degree in the partner universities
2.
China: heard that there is sth called 港澳台聯招試 and 免試錄取計劃
Taiwan:
https://sites.google.com/a/ncnu.edu.tw/overseas/index/news/xuequn
not too much info for mainland and taiwan, coz i haven't got as much info in hand as those in the upper deck