A History of the Vietnam War DSST is another example of an exam that doesn't receive much attention. I think that's mainly due to the subject matter and people's aversion to tackling it. Here's the good news: even though many of the names and places may not be familiar to you, they aren't hard to learn. It's a tragic, yet fascinating part of history, and there's a reason it has remained so prevalent in the American psyche. We've tried to provide everything you need for this exam. It's tough, but not impossible; so if you find this one on your list, don't stress over it. You can do it!