I practice with focus an hour a day, but I never feel quite "ready" for my lessons.
Is this just par for the course?
One of my goals has been to get through a lesson without my teacher correcting me in any way, and I feel very far away from that.
This is a common misperception because of how we were trained in school. When you have math. homework, you try to hand in your work with perfect answers. That is the nature of academic studies. Music doesn't work that way.
When you have music lessons, your teacher is shaping your skills. So as you play, she sees which thing she should shape next - how she can guide you more and more into a musician. If everything is perfect, then there is nothing to teach. Your abilities refine themselves over time. That's the first thing.
Meanwhile most teachers will be stressing some particular thing that they want to see developing in your playing at certain times. Maybe it's correct notes, or even timing, or a certain way to move for a kind of passage. Whatever your teacher stresses, that is what she expects you to focus on in your practice. If it was even notes, and you come back the following week trying to be a virtuoso with emotionally moving music, but the notes are uneven, then you didn't work on what the focus was supposed to be. If there are signs that you worked on what was asked for, then the teacher can continue guiding you. She is looking for that thing improving - not for perfection.
A teacher will also want to see if what she asked you to do is working. So if you practise it, and you come back improved, then it's working - if it hasn't, she might try something new. So if you practise as you are told, and toward what you were told, your teacher will see that. Perfection is not the goal - unlike math. homework.