Ok, so my SAT is next week and im slightly nervous- I’ve finished the blue book (CB), Barron’s, (along with Barron’s 2400 and the writing workbook). Is my prep more or less sufficient? Should I go thru Princeton review or Kaplan? How about Peterson’s? I know this is a really oft-repeated subject but still 
Btw I’m only talking about the SAT reasoning test, not subject tests.
You should estimate the number of questions you’ve answered. If you have answered at least a thousand already, then your prep should be sufficient enough.
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There’s not much time left, so you should only consider options that could help you quickly. What grammar scores are you getting on the blue book tests. If less than 650 I would recommend that you get Erica Meltzer’s Ultimate Guide to SAT Grammar overnighted.