How do I quickly and efficiently learn a new language?

I agree with experts answer. Thanks for the invitation. 

I couldn't agree more with what Ahmad Mohammad has stated. He hit the nail on the head.

·        I think you have a subject that you love most when you study. Consider the new language that you are going to learn as your favorite subject.

·        You don't need to be not genius, just be resourceful.

·        Read books, documents, magazines, etc. written in the  language.

·        Watch movies prepared by the language (documentary, entertaining, cultural, religious, etc).

·        Practice speaking the language. Practice makes perfect.

 First of all you should  have the passion and the intention to learn

then u should get the suitable sources for learning then u must be patient and depend on yourself only and u must listen and listen and listen even if u do not understand but listen eventually depend on Allah  then yourself

All the best

Thanks samar for your invitation

First of all you must feel like the language you want learn it, then try to take lessons, and try to used, i hope this can help.