I think that, if you want to learn English for speaking, then you should try to speak and listen more, instead of reading and writing a lot. But, if you are planning to study English or study at a college or university, in English, then you need to read and write in English most. What do you think?
I have not yet studied in a different language abroad so my answer may be biased.

From leaning multiple languages I feel that written and verbal forms of a language should be learned in conjunction as they affect each other heavily. They are both important. My knowledge of written versus spoken language has bitten me in the past.