Grade 13 is what age? 18? US system has 12 grades starting at age 6 or 7. Replying to: Doc,very impressive.About25%of HK kids learn to differentiate f(x)=sinx -- Pandagon C-in-C Post ReplyForum Canis Majoris 08/08/2016, 18:35:09 Author Profile | Edit Recommend | Alert | 5 4 3 2 1 0 -1 -2 -3 -4 -5 Where am IGo Up Go TopPost ReplyBack

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