First of all, why you want to learn english? TOEFL reachs 660 or V 800 can only get you into a graduate school; that's it, nothing more nothing less. However, have the ability to use language fluently will help you to write a thesis, create a joke or find a career.
Language is a utility not a trophy; learn it with love, fun and patient.
Get used to it then it will become part of you.