Which word book is the best for passing CET-4 and CET-6?

After CET-4 and CET-6, I think it is enough to buy a word book and real questions. Word books need words that flash by, and real questions need to be explained sentence by sentence, so you don't need to buy too many. The specific books are as follows:

1, "four-character flash" and "six-character flash"

According to the test frequency, the words in Flash Reading of Vocabulary Band 4 and Flash Reading of Vocabulary Band 6 are divided into six parts: high-frequency words, medium-frequency words, low-frequency words, occasional test words, simple words and super-class words. Personally, I think it is enough to memorize high-frequency words, medium-frequency words and low-frequency words. This book is comprehensive and focused, which can save us a lot of time. In addition, this book changes the boring memory experience of traditional vocabulary books, and adopts the "root affix memory method" to equip words and compound words with an interesting short sentence to assist memory. In this way, it can not only help candidates to remember the meaning of words quickly, but also make the memory process interesting, greatly reduce the memory burden of candidates and make words more reliable.

2. The sentence-by-sentence exact solution of the four-level real questions and the sentence-by-sentence exact solution of the six-level real questions.

This series of books fully considers the needs of candidates with weak foundation, solves the real questions word by word, refines every sentence and every test question, and helps us to "study the real questions while supplementing the foundation", thus achieving substantive scores and easily passing the grade. This book is the first to explain the grammar of real questions sentence by sentence, and to break every sentence in reading comprehension (choosing words to fill in the blanks, long reading and close reading) into pieces and explain it in detail. Analyze long and difficult sentences in the form of "sentence diagram", and analyze simple sentences thoroughly in the form of concise "sentence explanation"

I hope I can help you.