I spent some time today putting together a diagnostic math drill for you to try, if you're so inclined. It's 20 (pretty hard) questions, formatted more nicely than I usually bother to do on this blog and completely printable. It's not meant to be done in 25 minutes like an SAT section; it's meant to help you identify some weaknesses so that you can start to fix them.
Whether you're just starting your SAT journey or you've been at it for a while, my hope is that this will be a great jolt to your math prep.
All done with this one and want more? Try the more difficult Diagnostic Drill #2!