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"Как раз" - we speak so, when we speak about some coincidence.

- Дайте мне три гайки.
- Пожалуйста, как раз три осталось.

Зверюга = зверь юга!
Animal from the south.
(Шутка :) )

"Шестерка" - is the object with value 6 in some characteristic.
For example, we can call "шестерка" - the veneer with thickness - 6 mm. Of course, listener should know what is the speech about.
...

No difference.
But, "пять" is more official.

If we look at the phrases without context:

- Что ты? = "Oh, what did you say?", "Is it really so?" - doubt and wondering.

- Что тебе? - "What do you want?" (uncivil form)