start using dictionary

As far as I have learnt, correct spelling only comes with practice. When you are reading something it might not be possible for you to actually write down every word you are uncomfortable with. My suggestions is this : 1. Read a lot. Keep reading without bothering to remember the spelling.In due course of time, your mind will adjust to finding out errors in spelling with ease. 2. Write a paragraph everyday. I have seen that writing a paragraph everyday helps me learn and memorize the spellings of new words. Once you have started writing a few words, you will find it hard not to remember the spellings :)

Read books and write it down all the words that you don't know them. After that read the words over and over again until you feel okay with. Second ask someone to give you spelling test.