I Need to Figure Out How to Enhance My Vocablary Skill

These day, I have been studying with NCLEX-RN 10,000 – Powered by PrepU. I have done 500 questions so far. By doing the exercise, I have realized that I needed to enhance my vocabulary skill. I have made mistakes because of lack of my vocabulary knowledge. I know most of medical vocabularies because I have studied medical terminology very hard before. However, I don't still know many advanced general English vocabularies. If I had knew those vocabularies, I could have found correct answer in most of cases. I need to figure out how to improve my vocabulary skill. I have 11 more weeks until the day of my first NCLEX.