Which techniques are the best to teach English in a group with different levels?

I want to learn Korean! Hello, everybody. I'm a native Spanish speaker and I know English. But now I want to lear Korean Language. I was taking some clases in my city but now I can't go to school and keep learning... so if somebody knows and want to teach me, I will be so glad. Thanks!

Wall-e I'm watching Wall-e movie. It's a beautiful piece of art. It shows how can people of the earth finish if we don't start to clean our place. I'm not an ecologist because I don't have the habit but I care about my space. I try to recicle all my trash. Coming back to the movie, there's other topic: our healthy. It shows us how people can damage its body if we don't work out. For example myself, I stopped to do exercise so I gain some kilos. Even I don't want to see a bascule, I'm scared! But this monday I'm going to eat more vegetables and do thirty minutes of exercise at least. I will tell you how is it going. Now I'll continue to watch Wall-e.

My cat is pregnat. My little cat, Peggy is pregnat and I don't know what to do. It's my first cat and my first pregnacy. I'm reading a lot of articles about it but I'm still scared. She's my baby girl, all night she jumps on me and wants to touch her. It can pass a lot of minutes then she asleep. It's a nice moment to me. And she has a particular way to eat. When I give her food, she takes her time. She loves meat. If you have cats or experience in it, give me some advices, please! Thanks a lot.

Which accent is better to learn English? A few weeks ago a teacher from EU told: "If you want to improve your pronunciation, you should choose an accent, american or british and focus on that." Is that a correct technique? Why that teacher told me that?