When I did the test for my 5 year license some of the questions that were translated to English on their little computer simulator ranged from amusing to downright dangerous. On one it was apparent that the correct answer was that you needed to give way to the left. When I pointed out this could not be correct he was adamant that in Thailand you give way to the left. I told him that if that was the case then Thailand is unique in the world with that rule and he seemed quite chuffed that Thailand was indeed unique in this.
I still don't know but give way to the right. Roundabouts are a free for all, enter at your own risk.