You can really improve it if you often speak in English and in a community full of English speaking people. You should also watch your grammar and pronunciation of words and sentences.

Find movie scripts online. They are easy to find. Movie scripts are good because they are almost pure dialog and you can probably find scripts of movies you have seen or can easily get in India. You combine learning with fun.

well, depending on how far you have already come, it is best to learn basic words and phrases first, such as: 'welcome' - 'shagothom' 'my name is....' - 'mere naam hai.....', 'amar naam....' 'your name is....' - 'aapka naam....', 'tumar/apna'r naam.....' etc 'his name is.....' - 'uska naam.....', 'tar naam....' generally, i think the best way is through reading, writing and communicating/speaking and exercises/testing..... i.e read through different words and passages in english out loud to help with pronounciation and when you are writing. also listen to people or audios in english, such as songs or films. trying to have a conversation with other in english should also help! you should also make sure that you are testing yourself by completing different exercises or simply naming things when you are at home or outside, for example: 'this is the tap', 'i am shopping', 'tree', and so on!! testing yourself allows you to see where you need to improve and also how far you have come! dont forget to reward yourself when you get a good result :) finally, keep at it and keep practising!! good luck! :)