I have around 8 years of work experience. At this stage, the possible step is to go along management track. But, I am neither interested nor does it appeal to me. Thinking more on this, I have decided to go back to school, preferably for a PhD or, in the worst case, a master's degree.
My GRE and GPA are not so strong: 1100 GRE with 770 in math and 3.0 GPA (out of 4.0). My experience includes companies like Amazon and Zynga, but I have no research experience whatsoever.
Am I a good candidate for PhD or master's with research? My primary interests are in computer graphics or applied mathematics in simulation/visualization. What do you suggest I do? I am aiming for top 20 schools, but not sure if it will be right thing to do.