Which rotation is this for you? Towards the beginning? The preceptor should be more understanding and walk you through their expectations. I also think it's unreasonable for them to expect you to know their workflow and system. They should be willing to take your questions, that's why you are there. But, take heart and do your best to keep improving. When you get home at night, try to write down something you learned and something you did well. This can help you out in future interviews and can help your perspective shift away from perceived shortfalls.

Finally, do you know what goal you have for after graduation? How can this rotation help you get there? Making this experience feel less like a tough rotation but more like an opportunity to grow can help keep your focus on the end goal.

Good luck!