I know this is from Feb - but I thought I would add my 2¢ for other people considering taking it - Vietnam was HARD! But I took it and passed - so not impossible.

I thought I knew the subject - but apparently I did not! The PBS series is crucial and there is a book by Stanley Karnow "Vietnam: A History" (available through audible in audio format) that was also very helpful. Those were the only two resources I used.