This very year, my sister started college after 5 years as a chef. Her math was shit, especially since it was already not her strongest subject in highschool, 5

This very year, my sister started college after 5 years as a chef. Her math was shit, especially since it was already not her strongest subject in highschool, 5 years prior. She started very low and ended up average (she's going into biology). With help from me and Wolfram alpha (sry about that advertisement but it helped a lot). She was graded below average even though she showed more progress than at least half her class (since she started almost at the bottom and ended up in the middle). She doesn't care, but still think she is bad at math, when she just had poor teachers in HS and showed learning abilities at 23.