Real life and tutoring are so much more effective. Dellasta The ability to spell is dependant on phonic knowledge, on which spelling rules are based. This book helps parents of poor spellers catch up on this knowledge from whatever point they missed out, if wide reading and previous studies have not already filled the gap. See also LEM Phonics for teaching reading. Grasping a term includes comprehending the concept, and single words can be juggled easily where long descriptions would become unwieldy.
All vocabulary is beneficial.
In 20 minutes a day, Wordly Wise creates an interest in word usage, and is effective and enjoyable. Similar to above, but for younger students, with illustrations. We believe that grammar is important but that mastery does not require daily lessons for 13 years. In our search for an efficient course, we finally found this series from the publishers of Wordly Wise. There are three books altogether and each can be completed in a block of 4-6 weeks or in weekly lessons for half a year.