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Mock Exam question

 
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Hi,
in SCWCD mock exam, how will I know the answer for the question?. How man question I have to answer to see the resutl?
Is there a way I can see the answer as soon as I submit the question? or can choose random 10 question to answer?.

Today I got the following excetpion.
Error page Scwcd_Error
An error occured in the bean. Error Message is: null
Stack Trace is :
java.lang.NullPointerException
at com.javaranch.jspbeans.scwcd.QuizBean.execute(QuizBean.java:216)
at __jspPage63_carl_scwcd_scwcd_mock_jsp._jspService(__jspPage63_carl_scwcd_scwcd_mock_jsp.java:92)
at com.orionserver.http.OrionHttpJspPage.service(.:56)
at com.evermind._cp._vhc(.:5639)
at com.evermind.server.http.JSPServlet.service(.:31)
at com.evermind._deb._lnc(.:514)
at com.evermind._deb._wmb(.:170)
at com.evermind._co._wbb(.:581)
at com.evermind._co._fs(.:189)
at com.evermind._bt.run(.:62)
 
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