Hi,
Recently I completed IBM Certified Specialist - WebSphere Advanced Single Server Edition V4.0 and I got the certification package within two weeks
I would suggest to read the following materials to clear the exam (which I followed)
1) EJB 1.1 Specs ( lifecycle, transactions)
2) Servlet 2.2 and JSP 1.1 (except TagLib) Specs
3) DTDs (application_1_2, web-app_2_2, ejb-jar_1_1, application-client_1_2)
( u can get all the above from sun java site)
4) AAT
5) WebSphere Web Console
6) VisualAge Enterprise Edition V4.0
7) EJB Design guidelines
Also read the WebSphere RedBooks once.
one month preparation is enough to clear the exam.
I hope it helps.
Thanks
karmegam