Dear Madam,
To have a command on any language you need to learn its grammar first.
For English grammar I would suggest "English Grammar by Wren & Martin" a book available in book shop which will give you basic lessons in grammar.
Next,as many have suggested read English newspaper I suggest Times Of India,Mumbai edition.
Lastly, speak only English as you know/can.
Best of luck.
To have a command on any language you need to learn its grammar first.
For English grammar I would suggest "English Grammar by Wren & Martin" a book available in book shop which will give you basic lessons in grammar.
Next,as many have suggested read English newspaper I suggest Times Of India,Mumbai edition.
Lastly, speak only English as you know/can.
Best of luck.