Great advice Seahorse.
Would echo the "doing it alone." Drive your kid there if you like but STAY IN THE CAR.
Don't over-prepare. Think through answers to the above questions but don't memorize them.
And one minor tweak -- don't always try to turn a weakness into a strength. This goes to the "what are you bad at" question, which is one I always ask. Sometimes, we want to see that you realize you aren't perfect at everything. No one is. I get somewhat annoyed at those who say, "I'm too organized" or garbage like that.
You can either say something like, "I can't sing at all, so try not to do it other than in the shower." Or, "I'm not the best runner in the world, but I've been working with our track coach at school for the past year and have brought my mile time down from a 7:30 to a 6:15."
Also, you can get questions from left field. I've heard MOC committee ask, "What are 5 adjectives that describe you? or "What is the last non-school book you read and why did you choose it?" And many more. Unlike BGOs, they have no specific things they must cover, other than those dictated by the MOC.
If a question seems from left field, take a deep breath and give yourself a few seconds to think about it.
As for current affairs, no one expects an encyclopedic knowledge. However, having SOME idea what's going on in the world makes sense. Have your child read the "front page" of a major newspaper or on-line service (CNN, NYTimes, FoxNews, Washington Post) each day. That will be enough to talk intelligently, more or less.