Oracle has dozens of OCA level certifications, many of which require multiple exams. Without more information, it's hard to help you.
Thankfully, Oracle has a site dedicated to certification. That site documents all this information for each exam. And walks you through what the requirements of each certification are and which certification path is likely to be most in line with your job role.
Thanks for the information. Do you have any information regarding current OCA exam pattern because I have to take this test?
Start by visiting certification.oracle.com.
Certification Forum Moderator