Practice practice and practice!

Read newspapers daily. Try The Hindu and The Indian Express. Give special attention to the editorial section. Read books of Norman Lewis.

All the best!

dear student

 you can try the following to increase your  vocabulary:

Solve as many verbal reasoning problems as you can.Focus on the variety instead of the quantity.

Analyse where you are going wrong and work on it.Say you are getting odd man out questions wrong frequently. Set aside two days exclusively for that and make it your strong point instead of weak.

Make sure your reading speed is upto the mark. There are various speed reading techniques and tricks available online, you must utilize them.

Revise the vocabulary at regular intervals. Inspite of learning the words with vontext and using them in sentences, our brain tends to forget them. So a proper revision every 15 days or so will keep words fresh in memory.

Get basic knowledge of various subjects, atleast the terminology specific to the fields like medicine, politics, philosophy, economics etc.

hope this helps

All the best!!!