[MENTION=61119]drewa[/MENTION]
Hello, I'll try to help with all I can.
1. My grades weren't too perfect either, but I got in, so I don't think that it has that big of a say. Most of what matters is their own screening - exams, interview, motivation and such. Even more as your grades seem pretty damn great, I believe you shouldn't worry. You wouldn't be able to change anything now either, would you now? Nope, so stop worrying about this, it'll be fine!
2. Social sciences have to take 3 exams: Japanese, English and Mathematics. Latter two are in English, Japanese exam is of course in Japanese.
Here are past year exam papers to help you study. I suppose the best thing for you to do now would be to go back this thread to June when everyone started taking them, there are many comments, including my own. But keep in mind that the format of the Math exam is of pre-2010, NOT 2010. They changed it back after that one year.
And one special thing about this year's Japanese exam was that you had to WRITE KANJI, which, as far as I've heard, hadn't happened before.
Sorry, I'm not sure what you mean by "And what was the level of the language that it was in?" as those were exams prepared by the education board, so it was of a normal comprehensible level XD
3. Once again, go back the thread to June and onwards, everyone shared their experiences, there are a lot of questions written down word by word as we were asked during the interviews.
I hope I helped at least a little XDD Good luck!
And seriously re-read this thread from the beginning, there's loads of great information from the very 1st page.