I accidentally registered for ' Oracle Certified Professional - Java EE 5 Web Component Developer Exam' whereas I wanted to register for the latest 'Oracle Certified Expert - JSP/Servlet Developer 6' exam.
I know that you can reschedule to a different date, but I am not sure if you can change the exam. If you need an answer, your best option is to call the pearsonvue customer service support line. http://www.vue.com/oracle/contact/
I’ve looked at a lot of different solutions, and in my humble opinion Aspose is the way to go. Here’s the link: http://aspose.com