30 Days To Better English By Norman Lewis

What you say is important—but so is how you say it. If you find yourself using the same words over and over again, making embarrassing mistakes in grammar, or misspelling and mispronouncing words of average difficulty, you may be hurting your chances for success in school or on the job—without even knowing it! 
If you’re not satisfied with what your English says about you, test your problem areas with this popular, remarkably effective handbook. Each of the thirty short chapters zeroes in on a different aspect of grammar, usage, spelling, and pronunciation, with challenging and often amusing exercises to help you monitor your daily progress.