Easiest DSST History test?

[heathclayton]

I almost done! 3 more tests! Woo Whoo!

Questions:
I need an upper level history test. I have already taken Rise and Fall of the Soviet Union. That leaves:

Modern Middle East DSST (Instacert has flash cards for it! )
Western Europe since 1945 DSST
Civil War and Reconstruction DSST
History of the Vietnam War DSST

Which one is easiest? Which one is easiest to find study materials for?

Thanks!
Heath