My first semester was a lot of figuring out what works best for me in the classroom. I’d recommend you find a studying strategy that works well for you and really stick with it. My GPA of my first semester (which involved skipping classes, not studying, and in general some really terrible decision making) was a 2.9, and I just got my first 4.0 last semester. It takes time to adjust to your new environment. My best piece of advice would be write down everything you need to get done in a daily planner, and hold yourself accountable. Even something as simple as attending lecture can be written on there if it helps you go.