The vocabulary handouts from this year used words from the General Service List. This is a list of the most common words in English. There are 2284 words on this list. We learned the first 340. If you know all 2284 words, you can read about 85% of all written English (books, magazines, newspapers etc.). You can see the full General Service List here.
Remember, the most efficient way to remember new words is by using flashcards with spaced repetition. I encourage you to continue to study these words, and to continue to do extensive reading.