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The only way to improve your vocabulary and grammar is by reading a lot of books and magazines. To improve your spelling write and see all the difficult words over and over.
once you do all of this, it will become easy for you to write sentences correctly .
For this you must not try to memorize things you should understand English and try to communicate in English in on the daily basis and for leaning and improving your vocabulary try to make use of better words and always keep a dictionary aside that will definitely help you otherwise there is no such shortcut or you may say temporary method and if you will do this it will of great use to you in future.