Read editorial page of Times of India and write the gist of the entire article in short on your own. This will help increasing your reading speed and boosting your understanding level. This will not only improve vocabulary but also improve your reading speed/accuracy in Reading section. Additionally you can read online magoosh vocabulary lists. It's important that the vocabulary word applied in the sentence should not change the sentence meaning and should sound grammatically correct. Also, get your basic grammar rules/concepts clear. Avoid sentence construction /punctuation error. Don't use unnecessary conjunction to join sentences. End the sentence where you can putting a full stop. Read online British and American business news to improve your vocabulary.