Questions Involving Amane Suou's Arc (Spoiler Alert)

I've just finished the whole series, but there are some questions that are bothering me:

[Spoiler] 1. When Amane Suou came back from surviving the trip, why did the classmates question her for surviving?

2. What did the girl say when she was assuming how Amane survived? It was blurred out.

3. How did Kazuki know the deer meat wasn't actually deer meat?

4. Why did the class president have sex with the director/teacher of the basketball team? Was she forced or what?

5. Why didn't Kazuki and Amane leave any sooner? If they left earlier they could've gone for help and saved the other people.

6. Why did Kazuki stay behind?

7. Wasn't there a sign for leaving the forest during the time of the bus accident? It was shown when Amane was with Yuuji.

8. Why did Amane go to the school she currently go to? Was it because of the trauma from the bus accident? [Spoiler/]





8.