Reddit reviews OCA: Oracle Database 11g Administrator Certified Associate Study Guide: Exams 1Z0-051 and 1Z0-052 Pap/Cdr St Edition by Thomas, Biju published by John Wiley & Sons (2009)
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Yes you need to find the materials and book the exams yourself.
The materials generally consist of books which you read and practice examples from. If you are curious I can give you some recommendations however none of them are free.
This is a pretty good book for the first exam (half this book) and you can't get away with programming in PL/SQL without reading [this] (http://www.amazon.co.uk/gp/aw/d/1449324452/ref=mp_s_a_1_1?qid=1417646086&sr=8-1&pi=AC_SY200_QL40)