Hi Deepa,
The NetBeans Certification Exam is useful for proving that you are an expert with NetBeans. There is not as much demand for the certification exam as compared to OCAJP/OCWCD primarily because it isn't as well known. So not having it probably won't eliminate you from consideration. If you don't have a job at the moment, I would concentrate on the Java certification exams first. You could use the NetBeans' exam to distinguish yourself from other candidates if most already have the certifications or comparable experience. You could talk about how the knowledge transfers to other IDEs in a heterogenous environment and how you have superior troubleshooting skills (profiler/heap walker/etc.). Unless a company has perfect code, the ability to effectively use tools to examine code and locate defects is very valuable. Writing new code is easy - the ability to locate a memory leak in 8 yr old spaghetti code quickly is priceless.
-Ryan
PS. When I interview candidates I will typically ask what types of tools they would use to troubleshoot a deadlock, identify a memory leak, debug an Ant script etc. (note, you can do all of these in NetBeans) Many candidates respond with "I'd use System.out.println" or the Task Manager in Windows. I've also asked what's their favorite IDE key strokes - one candidate replied Control-C and Control-V (didn't know any other key strokes).