I have brought all the MGMT guides through amazon last year. It is mentioned in the book that the contains in the book will be updated online. Please can u tell me which link should I follow to check the updated material .

The actual book chapters are not online in any form. There are online question banks associated with each book, which you can access using the book's ISBN number (the instructions are in the book) - that's the only online material associated with the book.