the head first servlet and jsp book 2nd edition is for scwcd 5 exam. there is no new head first book as of now. but recently a book is published by charles lyons OCEWCD study companion which you can refer. but i must tell you this book has been recently launched, but many people/ranchers have already cleared the exam by using head first book and reading the newly added objectives from here and there. what more, they have written down there success stories here on forums, which you can read. please refer the scwcd links at http://www.coderanch.com/how-to/java/ScwcdLinks and scwcd hall of fame at https://www.coderanch.com/how-to/java/ScwcdWallOfFame
subject: Is Head First Servlets and JSP, 2nd Edition good for Java EE 6 Web Component Developer Cert?