Don't worry my dear friend, may be you failed because you have to score in 90 ies(above 90), now you have full chance to score good marks in SCWCD.
Identify your weak points , memorize more key points , practice more & more.
keep asking questions on javaranch, if you can't find the solution to any problem(javaranch is itself is a key to pass any exam belonging to
Java).
pankaj