In fact, I don’t just want to get better; like most teachers I know, I’m a bit of a perfectionist. I have to be. Dozens and dozens of teenagers scrutinize my language, clothing and posture all day long, all week long. If I’m off my game, the students tell me. They comment on my taste in neckties, my facial hair, the quality of my lessons. All of us teachers are evaluated all day long, already. It’s one of the most exhausting aspects of our job.

Teaching was a high-pressure job long before No Child Left Behind and the current debates about teacher evaluation. These debates seem to rest on the assumption that, left to our own devices, we teachers would be happy to coast through the school year, let our skills atrophy and collect our pensions.

The truth is, teachers don’t need elected officials to motivate us. If our students are not learning, they let us know. They put their heads down or they pass notes. They raise their hands and ask for clarification. Sometimes, they just stare at us like zombies. Few things are more excruciating for a teacher than leading a class that’s not learning. Good administrators use the evaluation processes to support teachers and help them avoid those painful classroom moments — not to weed out the teachers who don’t produce good test scores or adhere to their pedagogical beliefs.

Worst of all, the more intense the pressure gets, the worse we teach. When I had administrators breathing down my neck, the students became a secondary concern. I simply did whatever my assistant principal asked me to do, even when I thought his ideas were crazy. In all honesty, my teaching probably became close to incoherent. One week, my assistant principal wanted me to focus on arranging the students’ desks to fit with class activities, so I moved the desks around every day, just to show that I was a good soldier. I was scared of losing my job, and my students suffered for it.

That said, given all the support in the world, even the best teacher can’t force his students to learn. Students aren’t simply passive vessels, waiting to absorb information from their teachers and regurgitate it through high-stakes assessments. They make choices about what they will and won’t learn. I know I did. When I was a teenager, I often stayed up way too late, talking with friends, listening to music or playing video games. Did this affect my performance on tests? Undoubtedly. Were my teachers responsible for these choices? No.

My best teachers, the ones I still think about today, exposed me to new and exciting ideas. They created classroom environments that welcomed discussion and intellectual risk-taking. Sometimes, these teachers’ lessons didn’t sink in until years after I’d left their classrooms. I’m thinking about Ms. Leonard, the English teacher who repeatedly instructed me to “write what you know,” a lesson I’ve only recently begun to understand. She wasn’t just teaching me about writing, by the way, but about being attentive to the details of my daily existence.

It wasn’t Ms. Leonard’s fault that 15-year-old me couldn’t process this lesson completely. She was planting seeds that wouldn’t bear fruit in the short term. That’s an important part of what we teachers do, and it’s the sort of thing that doesn’t show up on high-stakes tests.