You can purchase this book from Amazon on this link:
Amazon.co.uk
http://www.amazon.co.uk/English-Punctuation-Spelling-Vocabulary-practice/dp/1481986643/ref=sr_1_1?s=books&ie=UTF8&qid=1368469019&sr=1-1
Amazon.com
http://www.amazon.com/English-Punctuation-Spelling-Vocabulary-practice/dp/1481986643/ref=sr_1_1?s=books&ie=UTF8&qid=1390900919&sr=1-1&keywords=English+Grammar%2C+Punctuation%2C+Spelling+and+
Vocabulary+practice+book+6%3A+Essential+revision+and+practice+pack+wit
h+answers+Levels+3+%E2%80%93+5