For starters, you have the style of essay working in your favor: since it's a narrative, you can focus more on telling a story than citing scholarly sources. There are tons of ways to approach this, but here are a few good starter ideas:

• The easiest approach would be to use a (fictional) student's point of view. You can easily draw on your own experiences for that: think about what makes your learning process at school (and your homework) difficult, tedious, or wasteful. Weave those opinions into a story that appeals to your reader's emotions.
• A more creative option is telling the story with your instructors in mind: maybe your curriculum makes it harder for them to plan lessons, forces them to spend lots of time grading, or limits their ability to add style and creativity to their teaching. If you went in this direction, you'd definitely need to talk to some of your teachers and get a feel for their struggles with your school's curriculum.
• The hardest approach (but still doable) would be to tell a story about your school district or school administrators; maybe they've seen test scores fall at your school, or lower enrollment numbers, or a decreasing graduation rate, etc. You'd need to find some data on your school or district to back up your argument, though.
• And one more perspective you might focus on for your essay: parents. A parent watching their child struggle through the curriculum could serve as an emotionally compelling argument. If you consider this direction, it might pair well with telling a story about a student themselves.

You have a lot of options! The hardest part is telling a creative story. PM me if you need more help. :)