memorizing a dictionaly

I bought a English-English dictionaly because I decided to build up my vocabulary faster.
I'm aming to memorize all words and phrases in this book.
Some people may say it's ridiculous to do that but this contains about 28,000 American English words.
If I can do it I'll be able to understand almost all of news,books and magazines.
And I also gain a a lot of expression in English and how to describe things.
Building vocabulary means to strengthen input skills but also output skills.My TOEIC score has been stayed around 850.This result is probably enough but I really get score over 920.That's because that I heard Global leading company Samsung requires all employees to get at least 920 on TOEIC to be promoted to manager.
I'm an employee of Japanese Electronics manufacturing company so I wanna be able to pass the rival's certification and more.Once imaged a goal it get easer to achieve something hard. I'll do it.