The TOEFL has four sections: reading, speaking, listening, writing.
The best advice: study grammar! It's true that there is no grammar section, but the TOEFL tests your grammar in other ways. For example, if you don't understand the grammar in the listening or reading, you won't be able to answer the questions correctly. This really is a tricky test!
For the speaking, I recommend focusing on pronunciation, intonation, rhythm, and stress. The key is how well you are understood, not necessarily how well you speak.
For the writing, focus on essay structure and find a native speaker to correct your essays. Also, time yourself when you write an essay Here's a good website for practicing: http://www.cz-training.com/toefl/practice.html
For reading, don't just read a lot of books and newspapers in English. Always have a dictionary by your side so you can look up every word you don't completely understand. Take notes, and pay attention to the grammar. Just sitting and reading the newspaper for fun is next to useless.
For listening, find a transcript for a TV show you like. (You can get some here: http://www.twiztv.com/scripts/) Then watch the TV show with the transcript. Make notes and pay attention to how words are linked together in English. Again, if you sit down, turn off you brain, and watch TV or listen to the radio, it's almost useless.
Hope this helps!