As you say there are many ways, and a lot depends on you goals and your style of learning. For example, some people emphasize reading and writing, while others consider speaking the most important. Some love to read attentively freed from distractions, and some prefer to actively interact with other people. So there is no one best way of learning. Still, personally I would emphasize that learning a language should be foremost between the texts and your brain. There are many reasons for this, but the most important are: 1. Texts have the best forms of a language - learn those good forms, and other less complex things become easy. 2. Texts have high content - you don't waste time because of pauses, synchronizing, waiting, and other reasons. Essentially, the greatest challenge in learning a language is the vast number of words, phrases and structures you must master. If you go about it leisurely by listening to songs, watching interesting videos, and just chatting with native speakers, you may never get there. You need to try and actively study it, just like students studying to become a doctor or a lawyer do. You study earnestly at a high pace and you'll succeed. You fool around chatting, watching, and listening only, then you'll most likely never reach a competency. And for a serious and efficient learning, there is nothing that can come close to reading broadly.

learn words and practise grammar

Well, do you can study with the book's guidelines. Or choice your favourite music in English and memorize the lyric. You can also to find a teacher/partner to practice your English... Well, its depends what do you prefer.

First, reflect on your original reasons for learning the language. Second, have reasonable expectations. Third, look for milestones to gauge your progress. Fourth, view the process as a long-term investment. Fifth, use the new language as much as possible. How Others Can Help A student is only as good as their teacher. Learn from a qualified native teacher. Don’t give up, don’t quit. Definitely continue; continuously keep on learning and growing. You will benefit yourself and increase your confidence. You increase your value in what you offer to others. The English language is a key to endless opportunities. Energize your learning!

There is a site where you can learn how to be fluent in a language withing 3 months: http://www.fluentin3months.com/.​ If you like playing casual games you can try the Duolingo app online or on mobile. Overall the best way to practice is to speak it more with your friends, family or a language partner