It may depend on familiarity with the topic, but I used the DSST for History of the Soviet Union to fill this slot. The Instacert study cards were very helpful and I even did the study.com prep course too (it doesn't count for credit).
Ultimately, I found it easy but history is such a broad topic that it sometimes depends on your knowledge going in too. I preferred to sit for a quick proctored test instead of pursuing a formal 12-16 week class.
Ultimately, I found it easy but history is such a broad topic that it sometimes depends on your knowledge going in too. I preferred to sit for a quick proctored test instead of pursuing a formal 12-16 week class.