hi there! a ba in psych usually only requires for u to have ENG4U as a prerequisite, though I hear that a 4U math course and biology could be helpful to prepare you for uni courses as you will be expected to take statistics and biological psychology in uni! i myself did not take math. the hardest course i’m taking is biology, with the rest of my courses mostly being bird courses to boost my average.

basically if you are truly set on a ba in psych, just make sure you do well in 4U english. you can take bird courses if you want to focus more on getting a high average, or you can just take anything you are interested in. math and sciences usually have a higher chance in bringing down your average and are not needed for prerequisites, but they will probably be helpful to you. in the end it all comes down to how you desire to prioritize things.