Hi Aman,
English is now must not only as a subject but more effectively as a mode of communication. We cannot express ourselves without having a good bank of vocabulary. To define a certain task we need to have good command over vocabulary.
You can increase your vocabulary by remembering words with their various meanings and uses. Not only you need to remember, you have to practice and use it in daily conversation. Talk to your parents and friends and make use of the word which you have learnt recently. This is the most effective way. Besides you can read English newspaper daily and note down the words whose meaning and uses is unknown to you. You can watch English movies and read novels to enhance your vocabulary.
I am ascertain that following this you will definitely enhance your vocabulary and will have a large number of words in your vocabulary bank.
All the best.
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