1800 TOEFL Essential Vocabulary A list of 1800 essential words with definitions and examples, using frequent TOEFL topic categories, is presented for ESL students preparing to take the TOEFL. Students are likely to think that the more words they know, the better grades they earn. Meanwhile, it is impossible to know all the words presented in real TOEFL because they do not have enough time to prepare the test as well as enough skills to solve the questions perfectly.

Big English Plus engages students with rich and varied content, encourages progress with ongoing review and assessment and helps develop independent learning and critical thinking with challenging activities.
More reading, More grammar, More exam preparation.

CEFR: >A2+

YLE: Flyers

The TOEFL Master's Guide to a Perfect Score: Definitive Edition 2015

With The TOEFL Master's Guide to a Perfect Score you can improve your TOEFL iBT score IN LESS THAN 30 DAYS!! 
The TOEFL Master's Guide to a Perfect Score: Definitive Edition 2015 simplifies every question on the TOEFL iBT and explains clearly in concise American English how to answer each question on the test. 

Cambridge Proficiency. 100 Key Word Transformations - Answer Key Included The final part of the Reading and Use of English paper is Key Word Transformations. A sentence followed by a key word and a second sentence which has a gap in it. You have to use the key word to complete the second sentence so that it means the same as the first sentence. Each question is marked in two halves and it's perfectly possible to get one whole point in the exam just for getting a single word correctly, even if you don't know the other words to put in the gap. So you should always give every question a try.