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Wren and Martin's English Grammar continues to be the best text book in this subject. Along with studying the subject, you may practice by writing articles and essays and getting them evaluated either by a teacher or by a person who is an expert in Grammar. Similarly, make it a habit to speak in English, particularly to some close persons whose English is good, and who can point out mistakes whenever you make one. Once your basic grammar improves, you will automatically get marks, and you will also make progress in your career due to good communication skills.