New college student😬

Hello everyone so I recently graduated from high school and I am taking summer school courses (English 101 and ASL 2) I’m majoring in Biology and next semester I have a very crowded schedule. (Chemistry, PE, health, trigonometry, and English 201). This year I am struggling I want to be a surgeon so I’m shooting for A’s the best I can I am trying my hardest in the classes I’m in now but I have a B it’s not bad but I need an A and my worry is is if I can’t even do 2 classes and get an A how am I going to do 5? Does anyone have any tips for me? How I can manage my time better? Organization skills, any supplies I may need that not many people think of?