First of all, I think it’s great that you are so conscientious and forward thinking. The hardest classes for me was actually in the area of “nursing theory”.
As far as the math is concerned... it’s not super advanced, but you essentially need to get your multiplication and division tables memorized. It would be helpful pay attention to any word problems you need to do in math. And know your units of measure, both English (cup, half cup) and metric.
I think you will do great and any patient will be lucky to have you!
google and memorize multiplication and division tables
start cooking!! Cooking and baking will help you learn units of measure. If you use an online recipe, many of them will allow you to get the recipe in metric.