아직도 몰라요? Vs 아직 몰라요? What´s the difference between of them? They´re the same but why "도"?

What´s diferences between 니까 y 어서? 니까 cause and effect 어서 only reason ¿? I always make mistakes whith these verbs! Help me please tomorrow is my korean test about this n_n

한국 교통 수단. 요즘 한국어 수업에 교통 수단을 공부하고 있지만 교통수단이 많아요 그래서 난 기분이 어지러워요. 버스: 버스시내, 버스고속, 버스마을.  그런데 차이가 아직 모르겠어요. 또한, 택시에 대하여 많기도 해요. 택시일반, 택시모범. 그럼 차이가 뭐예요? 여기 페루에는 건 유형이 그냥 있어요. This days I studing about korean tranports but they´re a lot. so It makes me dizzy @_@ Most people do travel by buses or taxis? Buses and taxis really are a lot.... Here, In Peru there only ones type of buss and taxis.

When can I use "꼭" in a sentence? Example: 꼭 도와 줘요. Is only "I help you" ? or implies another expression? 꼭 먹고 싶어요. Is the same~

제목과 호칭은 차이가 뭐예요? What is the diference between these verb? o_O Thanks

I´d like = 한국으로 한국으로 If I wanna say "I would like to learn Korean" 어떻게 써야 해요? because it´s a wish or something likely that I wanna do it. But in korean I cant find something the same.

약 에벨린... 에벨린은 누구세요? 에벨린은 여자이고 한국어를 너무 좋아해요. 에벨린은 23살이고 페루에서 살아요. 에벨린은 밖에 한국 음악 안 들어요. 에벨린은 잘 한국말하면 행복할 거예요. 이름이 '나 보리'라고 무척 아름다워서 좋아해요. ^^