The names of some of the good reference Books for preparation of English words in TOEFL or Test of English as a Foreign Language are as follows:

Official Guide to the TOEFL Test With CD-ROM
McGraw Hill

Barron’s TOEFL iBT Superpack
Barron’s

Speaking and Writing Strategies for TOEFL iBT (Book & Audio CD)
Nova Press

TOEFL iBT High Score System
CreateSpac

Practice Exercises for the TOEFL with MP3 CD
Barron’s

Cambridge Preparation for the TOEFL
Cambridge

Kaplan TOEFL iBT Premier 2016-2017
Kaplan

Cracking the TOEFL iBT with Audio CD, 2016-2017 Edition
Princeton

Essential Words for the TOEFL
McGraw Hill


To maintain and enhance solid skills, here are some points to keep in mind for the future.

Read as much and as often as possible. Make sure to include academic texts on a variety of topics written in different genres as part of your reading.

Increase your vocabulary by analyzing word parts. Study roots, prefixes, and suffixes.

Use a good thesaurus to study various shades of meanings of words.

Practice using context to guess the meaning of unknown words.

Think carefully about how ideas are connected within a text. The connections between sentences and the links between paragraphs are critical to complete comprehension.

Learn to recognize different organizational styles in order to understand the way an article is structured.

Write a summary of a text, making sure that it incorporates the organizational pattern of the original.

Pay attention to connecting words in order to understand the pattern of organization.

Look for the common patterns of organization that you find in articles.

Continually practice using new words you encounter in your speech and writing. This will help remember both the meaning and the correct usage of the words.