Hi all!! Hope you are well!!

I went to see my doctor 4 wks ago and i told him what was going on. I didnt know the definition of ADD before i told him. Nor, paid attention to add/adhd stuff because it doesnt run in my family etc. I’m a college student. I failed a lot of classes because of me not staying in focus, thinking of something else when im supposed to be studying, cannot sit still, asking question bc i cannot understand/trouble understanding for the most part. My question is, should i tell my situation to my proffessor? Does school supposed to know this kind of stuff? I am retaking a class for the third time. At the same time testing the medication my doctor prescribe to me.