Easiest 700 SAT Subject Test?

Hello,
I need to score around 700 (680 or higher) on two SAT subject tests for certain colleges. I have taken the Math SAT subject tests two times. I received a 710 my second time taking it. I took the U.S. History without any prep, and I scored a 610. Should I focus on another SAT to get a 680 or higher, or should I keep focusing on U.S. History? Any feedback would be great.

Korean and Chinese by far.

At least, statistically speaking.

You really can’t say which tests are easiest because it depends on your coursework and how much you really know it. Did you take the math I or II? Math II is harder but has a much more generous curve