I am planning to take SCWCD exam (310-083).... I am going to refer Head First Servlets & JSP by Kathy Sierra. Is it a good book for gaining in-depth knowledge and scoring good marks? Do you guys suggest a better book (if any) than HFSJ?
Don't worry about reading all those specs, occasional referencing is good enough. For me, I only referenced them for the relevant information when I felt the cover in the book is inadequate, or when I though the mock exam is incorrect.