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Topic: The first examination of Oracle for delivery

Good afternoon! I look on an Oracle site there was a new examination 1Z0-071 on 12 Oracles, handing over which at once receive OCA. It turns out now the fastest way. Now even it is better to hand over this examination than 1Z0-047. It was prepared now to 1Z0-051. Basically simultaneously studied questions from 1Z0-047. Whether prompt many questions on 12 Oracles in 1Z0-071 and it is how much difficult to hand over it? Or it is necessary to hand over at first 1Z0-051, then 1Z0-144. Whether it is necessary to repeat in the near future in this case on Oracle 12? Thanks