One way to improve your vocabulary is by learning antonyms and synonyms. An antonym is a word that has a meaning that is the opposite of the word given, for example: 'good-bad'; cold-hot; brave-cowardly.
When writing it's useful to have a choice of words that mean near-enough the same thing, otherwise your writing is dull and repetitive. Like this:
I'm sure you can do better than that! In this 11-plus quiz you are going to get some more practice in improving your English vocabulary. If you come across any new words in this quiz, try to remember them.