I'm not sure what type of Psychology you are going into, but if I were you I would at least aim for a min 700 in Quant. if the program draws on quantitative analysis. Edgewise, schools like Cornell require 600 in each section as a minimum.
Remember it's a CAT so take your time on the first 10-12 questions. I would also make sure to be comfortable with triangles, exponents, probabilty, factoring, etc.