Read the following pdf file from oracle (don't read chapter 1 - its wastage of time )
http://www.oracle.com/education/downloads/dba8i_cg.pdf
Set you mind for the exams and just give all the 5 exams in one slot within 1-2 months.
Do not ever relax once you pass one exam. Start immediately for next without any break until you
finish all 5 exams
For all 5 exams - don't read so many books. Buy only 5 books and all from 'EXAM CRAM'. These books are available in Barnes & Nobles and have red color cover. Everything is covered in these books
Do not give 'Performance and Tuning' or 'Networking' as your first exam
If possible give 'Database Administration' as your first exam
8 hours before every exam - STOP reading books , go to Barnes and nobles and start solving sample questions.There are 100 + questions given in all exam cram books and also there are books from oracle press on all these exams.Questions in oracle press books are tougher and very close to actual questions asked in the exam so you MUST also review questions from oracle press books
Networking is a boring exam so take this exam as the last exam may be !!
Backup and recovery is also boring so give it as 2nd last exam
Performance and Tuning is a challenging exam so prepare well !!
All the best !!
Please send an e-mail for any queries.
Ravi Mohan
Oracle 8/8i DBA Certified