Hello Elvis,
Reading as above mentioned as well as writing down the new vocabulary then using it in speech or written conversations; the repetitive use of the new words will help you memorize them.
Listening a lot to spoken English; if you mingle with native speakers you will have the chance to listen to the language continuously; catching new vocabulary on a continuous and repetitive basis helps you memorize it too.
There are many other techniques such as using games, flashcards,media (audio,video),online chats etc,or any other entertaining mean helps to acquire more vocabulary and again the repetitive use will make memorizing easier.
Good luck:)