I was bad at math, but I made a little study guide from the TEAS book. I studied that and worked out problems for a while, and I ended up getting a 90% on the math section. I took version 5, so it may be different, but the actual TEAS study book had problems that were exactly like the math section on the real test. The math wasn't really that hard once I went over it. It was more like stuff that I learned a long time ago (like in middle school), but because I hadn't seen it in a while I forgot things.
Every school is different in what they want, so I can't really say what passing is. I would guess that anything above the national average or at the national average would be passing... For my school, it was the first year they used version 5, so we just went by that.
Also, don't be worried if you don't do super well. You have the other sections to help boost you up in the end!