from OG:
Time schedule: typically 3h45m
within section: you are free to skip questions that you might have difficulty ansewering.
between section: once you completed a section, you may not go back to it.
break: 10-minute break follwing the third section and 1-minite break between the other test sections.
Scoring:
AW: 6
来源：https://www.cnblogs.com/oareii/p/12039716.html