Engishteststore.net offers TOEFLers free English tests and exercises online. Therefore, if you want to improve your TOEFL score, you can take the grammar, listening, reading, speaking, vocabulary, and TOEFL tests online, or you can download them and complete them offline if you are not able to be online for very long.
On one of the web pages of the site, you can complete grammar quizzes, idioms quizzes, reading tests, listening tests, and speaking tests. To help you with your vocabulary, you can get practice with antonyms, and synonyms.
To sum up, to get free TOEFL tests online, be sure to visit http://englishteststore.net/.