You should get overall 70% or more to clear the exam. and alsoCheck this links:
this is link from SAP about ABAP certification
Refer this thread from SDN and alot more are there on ABAP certification exam details and material.
/message/515239#515239 [original link is broken]
/message/279409#279409 [original link is broken]
please check the following site which offers some example questions.
Hope this be of help to you.
assign points if links are useful**