Spelling mistake is a commom problem for english learners ,especially for "green hand ".
How to improve such ability Different people hold different opinions .Here are some for reference .First ,when you run across new words in reading ,or listening ,please take them down as soon as possible .Meanwhile ,read aloud these words over and over again .
Second ,you must review them frequently within a period of time ,from reading ,listening to speaking .
Last but not the least ,make full use of these new words in your studying .