It's been a while since I tried this game. I remember an arrow highlights when is meant to be pressed, so you don't really need to remember which one to choose. If not, the beginning rounds have very few of them (around five or six) so it should be easy to remember (try thinking on something that resembles what arrows you must hit, instead of the actual arrows). For later rounds, when the one you must press is hidden, I try remembering the first three if possible. Then, before hitting the third, take a look at the remaining ones, so the next hidden one is the next one you should hit, and so on.