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IBM test 286 question: Which Patterns?

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Looking at the objectives for IBM's test 286 (Application Development with IBM WebSphere Studio, V5.0), I see that section 2 is "Application Development Best Practices" and is 11% of the exam.
One of the items listed under that section is "Apply server-side design patterns". Which patterns do I need to study?
IBM's "recommended educational resources" site recommends two books: "Core J2EE Patterns, Alur et al, Prentice Hall, 2001" and "Design Patterns, Gamma et al, Addison-Wesley, 1995". I have both of those books, but I need a little focus. The Core J2EE Patterns book is 450 pages, and the GOF book is 400 pages. It is not exactly light reading either.
Which patterns should I focus on?
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'Core J2EE' is more practical, whereas the 'Gang of 4' is more theoretical. You should concentrate on 'Core J2EE' and just read the first couple of pages of each pattern in 'gang of 4'. ALso, a fair amount of the 'Core J2EE' book is code examples, which you can skip for the first couple of reads, until you get more familiar with the concepts of each patten.
SCJP, SCWCD, SCBCD, SCEA (part 1), IBM-484
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