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The more you 'surround yourself' with English the better your own English ability will be.
Everyday try reading English newspapers on the internet. www.dailymail.co.uk or www.guardian.co.uk are two examples.
This will make you familiar with how English is written in a non-academic setting.
Can you get English radio stations over the internet? The BBC is particularly good because they have several radio channels.
Listening to English speech in the background will help your pronunciation.
Going to a teacher is good if you are the only student, or are in a small group of students. If you can afford it, and you have an important exam ahead, it is always worth having a teacher for a few sessions.
A teacher, even in just one session, will be able to advise if you are ready to take TOEFL and get a good score.