I think the exam developers carefully spreaded the distribution to all topics in the objectives so that an exam candidate would averagely know all topics on the exam...
But you might need to have a look at exam experience by others in the Exam Result Forum...

Co-author of SCMAD Exam Guide, Author of JMADPlus
SCJP1.2, CCNA, SCWCD1.4, SCBCD1.3, SCMAD1.0, SCJA1.0, SCJP6.0