Which Wrein and Martin book is good for English Grammar?
The book comprehensively covers all parts of speech. For a proofreader, there ain’t a better book. Use it as a reference guide and perfect your grammar over a period of time. Read though the chapters and solve the practice exercise. Give yourself time to complete the book . Do not try to cram it or you will end up getting frustrated.
Enjoy the process of becoming better at grammar.
Hope this helped!