I believe the book could give you a clear idea on the new features in JSP, like EL and JSTL. As Servlet 2.4 does not differ much with 2.3, you may only find the Filter part is relvant.
Basically, as the book is for the exam, you could expect that only a less topic is non-exam oriented. Thus, for getting basic ideas, HF S&J helps. But for in-depth information, you may need to read Core Servlets and JSP, as well as JaveServer Page 3rd edition.