Thanks Nitish.
Yes I read only HFSJ and practiced the mock exam given at the end of book. This book covers all the required topics for the exam and I enjoyed reading the book.
Amount of study depends on your existing knowledge of
servlets and jsps etc. I am already working on jsps and servlets and spent more time on unknown topics to me. Approximately i have spent 80 - 100 hours for preparing the exam.
Please follow the SCWCD forum. Most of the mock exam questions and concepts are discussed here extensively. Please check your PM