Hi,
I have passed SCJP1.4 with 80%. But, I think this is not good score

. So, can I again give SCJP exam after passing it once?
I want to give next level exam of SUN like SCWCD or SCBCD. So, what for should I prepare first, SCWCD or SCBCD

? Is it possible to give SCBCD without giving SCWCD?
Please help.
Thanks