The app greatly helped my general algebra in terms of quickly assisting me solve graphs, find slope, midpoint, etc.
It also helps in geometry where I can quickly refer to a formula and input numbers rather than flip to the back page of the test and try to find the right formula.
Lastly, the app is absolutely amazing at graphical analysis which works very well in tandem with the standard graphing function of the TI-Nspire.
This is in particular was invaluable for the SAT 2 Math.
I got a 770 on it by the way, and I feel the app helped me boost that score from where it was originally.