Welcome to CodeRanch! You posted this in our April Fools Day forum. I've moved it to the SCJP forum since it looks like a serious question. And Srinivas gave a serious answer.
I think it depends on how long ago you studied for the SCJP 6. If it was less than a year ago (or so), I'd say go with it. If it has been a long time, you've probably forgotten a lot anyway.
Note that you have to take two tests to get to OCPJP 7 anyway. It's going to be easier to take the
OCAJP 7 first. It's an easier exam. Then you take the harder OCPJP 7.