Hello~ Well to be honest, you should focus on everything but in my own opinion, you should focus more on speaking and vocaburary. Especially, Korean grammar is getting very hard as you learn more and more, but the approach is okay I guess. Since you are a basic learner, I'd recommend you to study vocaburary :) That way, learning Korean will be much easier, I promise. (But you shouldn't just write down the words and memorize them. You should practice speaking while learning vocaburary! :>) Have a good one :)

All of the above :) But if you're choosing to focus on one or the other, definitely go with vocabulary. You can learn all of the boring grammar rules in the world, but if you don't know any words, you can't say anything. If you know vocab but not so much grammar, you'll sound a bit like a caveman or child, but you'll get the idea across. Here's a way I suggest learning: http://www.italki.com/discussion/91279 (tl;dr don't just stare at words on a paper or screen, use them!)