Don't always pay attention to grammar. Free-writing can be very useful. It can show you that writing is fun. Have fun with the language.
2. Write emails in English
Stay in contact with teachers or other students.
3. Rewrite your local news in English
This is another exercise that can be done on a daily basis. Remember that regular activities are the best ones.
4. Learn important spelling rules
Remember, you won't always have a dictionary or a spell-checker handy, especially when you are writing a test. Even native English speakers need to review the spelling rules from time to time.
5. Learn commonly misspelled words
6. Learn common English errors
Source : englishclub