Actual exam is really very easy i wrote my exam yesterday and scored 91%.i was being tested on really easy stuff but from what i remember many problems were related to overriding, instanceof operator so if you get basics good..
you should be good to go.I remember when i wrote my 1st practice
test from KB book..i scored 39% and i was so upset.but as you keep doing test you realize where to look for weakness and then you gradually improve.