I remember how I felt this time every year during my undergrad. I was bummed that break was over but also a little excited for a new semester. I liked a fresh start, new notebooks and an opportunity for better organization each semester.
The article "How to properly kick-start a new semester" from Plaza College had some great tips on starting the semester off right.
1. Always do the readings.
Do it. I'm not going to lie, I didn't really start doing this until my junior year of college, but it was easier come test time if I had already read through the material. I could actually spend the night before a test studying instead of trying to read everything that was assigned.
2. Work ahead of schedule.
I'm not sure that I 100% agree with this tip, but it is important not to procrastinate early in the semester. It's hard to jump right back into the swing of things coming off of a break. Start assignments as early as possible, and you'll save time down the road.
3. Keep up with the material.
Don't just do the readings, but do them as they are assigned. Once you fall behind, it will feel impossible to catch up. Same goes for assignments. Get them done on time. Start working on them as they are assigned, rather than the night before the assignment is due. You will be glad you did.
With that said, good luck this semester! I hope it's your best one yet.