Chads Math Videos/MATH Destroyer two week before the exam is the way to go. I think doing all 12 tests is overkill but if you aren't good at math, go for it. I only did 5-6 and ended up with a 22. It's a good investment.
With math, I didn't go super fast like everyone always says to do.... I took my time and literally just ignored and immediately skipped over the weird, more complicated trig problems (lazy, didn't care, never using trig in my life) and tried to do everything else correctly. I think I skipped 2-3 of the harder trig problems?
Know your conversions, too... I think Chad goes over all the ones you need to know.