To get job in java in India at least, you don't need to give any exam (except for rare occasions).
Core Java- study OCJP (SCJP previosly) syllabus.
Advanced Java- learn JSP and Servlets
Thats all for beginners. And if possible, you should also have knowledge on C and data structures.
Note: Limited to only programming. Interviewers might ask you questions from other subjects like operation system, computer networks, etc. also.
The biggest gamble will be to ask a question whose answer you know in that it will challenge your theory | www.TechAspire.blogspot.in