考试最后半小时内不允许提前交卷。
多呆些铅笔
考场都有钟表的
没有草纸 只能在考卷上乱画
只能带铅笔
伦敦考场时这样 不知道国内有没有这么严格。

好像说是不能带有闹钟功能的手表吧？
另外，请问在考试中不能喝水吗？4个小时啊

可以喝水 但水杯不能放在桌子上 放在凳子旁边。

Answers:
1 you can leave the testing room only before the last 30 minutes,otherwise keep seated until the papers are collected
2 you can use pencilsharpener but not knife
3 you can bring watch without alarm function
4 you can use the blank pages in the booklet as scrach papers
5 yes only pencils are allowed

Above is the testing rule GARP sent to me in the testing center in Sydney, I think it should be similar all around