You can call or go to Drive Test Centers (website) to book it.
You can go to Drive Test Centers and face to face book it.
You can go to Drive Test Centers to Waite a cancel test and immediately go to test.
You also can call Drive Test Centers a few days ago to see there has a canceled test then you can take it.
All above can pay G2 test fee by credit card by call, online, or by face to hand in cash.