Does anybody feel like both learning and remembering/understanding content is more difficult?

I got the best grades of my graduating high-school class (years ago) and I was a sponge. I thought it would be the same in university. However, after my first semester at university it feels like learning is difficult and everything is slow for me. I feel slower than my classmates and what should take me a week to learn takes me a month. To add, I don't feel confident enough to continue learning although I have 6 classes left to graduate.

I am in my final year of electrical engineering and can not remember much from my previous years of learning. I feel like I forgot everything. To add, my thesis (project) starts next semester and I am worried that I can not use what I should remember and have learned previously.

Let me know if this is the same with you and how you have overcome this issue.