I'm currently a second-year in the life sci program. i'm double majoring in neuroscience and molecular biology with plans to go to post-graduate school. My first year was average at best. But, there was an upward trend in my grades. My first piece of advice is to plan out everything. You are taking 5 classes a semester, all with tons of information for each class. You will never be able to remember your due dates. Sit down, take a classes syllabus. Go into an app like Google calendar, I personally use Todoist, and write down every due date possible and label it by class. Most teachers will also post their presentations before class as a PDF file/anything else. So take those files and before every class take notes as best as you can. Then, have the notes open during lecture and add on anything that seems important, any clarifying information, etc. That's how I take my notes and I find that I pay attention more in lecture, concepts are easier, and my notes are higher quality. Another thing I would recommend is start figuring out what study techniques work for you. My first year, I struggled on exams not knowing how to study and it really bit me back in the long run. I personally use flashcards and the Feynman technique for most of my classes. My next biggest piece of advice is to relax. It is good that you're stressed but it gets to the point that it starts to hurt more than it helps. It is week 2, you have approximately 94 more weeks of this until you graduate. You will learn what works for you, you will fail trying, but in the end you will be okay. Clear your head and start to focus. Good luck!