I remember once Marc saying (In this forum) that if you know WEB.XML you are 25% done. Add to it, if you know the APIs then you are done for another 20%. If you know JSTL and EL Expressions then you are done for another 20%. And finally if you know Design Patterns you are done for some 5%-7%. The rest 30 odd percent come from related theories and concepts, and for that you need a book. Any book will do. I found Head First... to be cool... very basic... but to the point (I mean exam specs). As for the MOM (Mother of Mocks) in HF book, I played a trick... I wrote the exam, but I asked my roomie to tell me my score only. After one week I again took the exam. I had two answer sheets to compare and see my progress and weekness. One advice, use online mocks to get the feel and to get familiar with exam.