Babul! Do not get Depressed as it'll further degrade your performance.
I recommend you to visit the certification results forum.Recently there was a person that had very limited knowledge (specifically in SCJP) and he managed to clear this exam with 65%+ marks.Please visit this forum to build up your confidence!.
In the last days, it is equally important for you to study those not-so-hard concepts which can make a crucial difference between passing and failing in this exam(like static returns,enums,etc)
-and good Luck!
Do post your experiences