SAT II World History test or the US History test?

Hi! I’m a foreign student and I have never studied US history before so I have no idea about the course but I have also never studied the extensive syllabus of world history. I do take A level world history in school but it mostly covers all the European revolutions from 1600 to 1900 and the two world wars and the Cold War. I only have one month to prepare for this exam. I’m also giving the math 2 subject test.
Could you please help me decide which history test I should take. Which one is easier? Which one is more familiar? Which one is shorter?

If you’ve never taken US History then why are you even considering it? Go the CB website and do some World History practice problems. See if you can handle it.