Hey there, Meredith Jones Moody, hope you're doing well and enjoying learning here at KA. I see you want to practice SAT on an android phone through Khan Academy app, but I'm afraid to say that this feature isn't yet available. It is available, for now, only on the Khan Academy's website. 

But there's other way. You can practice SAT through any browser on your smartphone or tablet (best viewed in landscape mode). If PC or Laptop is unreachable to you, for now, this is the best way to do it.

Hope this helps! Have a great day!