1. Collect your previous board questions in English subject.
2. Try to memorize all the questions of previous board.
3. Make sure that you can make English sentence in your in your own skill.
4. Give proper preparation of the grammar items of English questions
5. Try to memorize all concepts of writing part of your English question.
6. English spelling must be learned properly.
7. Use colorful pen for looking good of your exam paper.
8. Give minimum two hours per day for reading English subject.
9. Always give priority on English home work first.
10. Try to learn more English words meaning at any time at any place.
So, if you really want to develop your English ability and place the skill on the exam paper, you should practice English a lot. You should improve your English grammar efficiency so that you can write fluently without any grammatical errors.