I really appreciate all your help. Is there a way to ... see which translations have been used? Is it the (C)?

Quote from mrvirus

I forgot to mention, but if you want feedback you can always made a post here http://mangahelpers.com/forum/forumdisplay.php/882-Quality-Control-Critiques?order=desc
there are skilled ppl lurking around there and are willing to give you a thoughts or two

If you've checked the link I gave, there are already several practice test pages you can try there, which you can post or even submit for feedback.

mrvirus' MangaHelper link is also very good as it has "challenge" pages which you can do the same thing in their forum.

u will see some line like: Reserved, For the sole use of [group name] etc at the beginning of the translation.