If you are looking for an app to improve your TOEFL scores this app is suitable for you.
collection of the most popular and frequently vocabularies which are used in TOEFL exam
If you master all of vocabulary of this application you are able to get high score of English speaking English listening.

Advantage:
☞ Use off-line can use everywhere
☞ Record and replay your voice
☞ Simple user interface easy to use
☞ Fast lightweight
☞ Free
☞ Remind TOEFL vocal every day