This Set of books consist of 5 different books including the English usage in different situations with the betterment of spelling. This book also helps in to imrpovement in grammar and punctuation. This book also guide to plain english. One book from this set will also help in to know the 1001 worlds which are very important and use of English language. This Set Includes : English Usage; Better Spelling; Grammar and Punctuation; Plain English; 100 Words you need know and use.