What king of exams do i need take if i want to study abroad in Universities in US, UK and Canada?

Hi, i'm a form 6 student studying in Hong Kong in a local secondary school(not in a international school) and i plan to study abroad in the future. First, should i continue my form 6 and form 7 and study abroad after taking the HKALE, or should i go before the end of form 6? Second, i want to know what kind... show more Hi, i'm a form 6 student studying in Hong Kong in a local secondary school(not in a international school) and i plan to study abroad in the future.
First, should i continue my form 6 and form 7 and study abroad after taking the HKALE, or should i go before the end of form 6?
Second, i want to know what kind of academic results is needed in order to be admitted in more prominent Universities(e.g. Harvard, Oxford, University of Toronto...) in the U.S. , U.K. , and Canada. Can i use my HKCEE or HKALE results? Would it be wise to use those results or are there any other more advantangous ways?
THX
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