In my school 4.0 is the best, and that's by getting straight A's.
I doubt you can get a 6.0
Is 5.0 straight A's in your school?
wow 5.0 great job but sorry cant go any higher
on a scale of 1 to 4?
I believe 5 is as high as you may go. I could be wrong though.
Theoretically yes, realistically no.
possibly if you take as many AP courses as possible, and ace them.
That depends on what GPA scale your school uses. Colleges ask for unweighted GPA, which means on a 4.0 scale. Weighted GPAs are meaningless for anything other than class rank.