If you're preparing for the TOEFL exam, then you know how challenging it can be to master the vocabulary required to pass it. The TOEFL iBT Preparation app by Xuvi is designed to help you improve your vocabulary across all the areas covered in the TOEFL test.

With this app, you'll have access to a wide range of vocabulary words commonly tested on the TOEFL exam in six specific sciences, including archeology, biology, environment, history and art, geology, and social sciences. Each word comes with an audio recording and definition in English, Vietnamese, and Korean, making it easier for you to learn and understand new words.

One of the most helpful features of this app is its multiple-choice test, which allows you to practice the type of questions you'll see on the TOEFL exam. You'll be given sentences and asked to choose the word or phrase closest in meaning to the highlighted part. Additionally, the app includes a group choice test to help you learn sets of words with similar meanings and a word choice test to help you find the right word to replace a given word in a specific context.