Trying to develop my skills...

I am reading my first book in English in order to develop my skills. It's a thin book, which is an adaptation of Forrest Gump. It's a book made for students, because there is, on the cover, specifications about levels, that is, each book is prepared for a specific level and has some titles. At the moment, I am reading a book for pre-intermediates students, B1, but I intend to enhance my vocabulary and soon, God willing, reach another level.

I'd like to study more about English grammar, because I've been studying English but I am not paying attention to grammar at all, but now I want to learn more about that, so I am looking for some good book. The day before yesterday I went to the library to find one, but the librarian didn't recommend any available books of English grammar, that's why I took another book, Forrest Gump, in this case.

I am also looking for develop my listening and speaking, although I try to watch some movies in English, it seems harder, I guess, than when you're talking to someone.

The best book for English grammar in my opinion is English Grammar in Use, by Cambridge University Press. I think it's the most popular grammar book worldwide. They have examples and exercises and it's a very intuitive book. Let me know if you need help getting through it!