Enthuware

Today i got my exam, but sad to say it was 61. but i should mention that i found nearly five questions which is already included in the question bank.

The worst thing is i had two questions regarding using "default methods" of interfaces which is included under the heading of Interfaces and Inheritance in Java Tutorials.

But that feature is coming with Java 8 - so codes written using this feature is not even compile in java 7

Sorry to hear about your score.
Oracle does sometimes introduce new questions on a trial basis but they do not include such questions in your score. At least, that is what we have observed in the past.

Then i don't want to study those things for the exam, isn't it????

No, you don't need to.