Нужно к огэ. много . проверьте, , правильность построения предложений в моём письме по . okay, it's really very unusual that you decided to learn japanese! but i support your choice. if you want something, you need to do it! as for your questions, in my school i study only english. but the english language with in-depth study. i also want to learn korean, because i like watching korean tv series and once i dream to visit korea. and soon i will go to the korean language school at the korean embassy!

Okay, it's really very unusual that you decided to learn Japanese! But I support your choice. If you want something, you need to do it! (need do it!  Без TO!, я бы тут использовала  MUST. You must do it!)
As for your questions, in my school I study only English. But I HAVE an in-depth study of  (the  - не нужен)English language. (ПЕРЕФРАЗИРОВАЛА)  I also want to learn Korean, because I like watching Korean TV series and once I dream to visit Korea. And soon I will go to the Korean language school at the Korean Embassy!    

VERY GOOD!