I have written SCJP 1.5 a two years back, at time due unavoidable reasons i don't get much time to refresh ... that really shown up in my marks. I was not happy with score which i got ... i am planning if i can write the exam again ???
if that the case is there any upgrade exams which we can write for SCJP 1.6 ??? does this reduce the cert cost?
You should keep in mind that score doesn't matters. The important thing is your knowledge about technology so don't worry about score.
If you already SCJP then go for other certification that will help you in real life coding.
Don't plan to take SCJP again. Once again I say you should go for other certification.