I currently work in school based and had a level II in it. School and district varies from place to place. Advocating and teaching people about OT is part of the job just like any other setting. My opinion and a broad statement: less people know about OT in education compared to medical. School is a very specific setting similar to early intervention or NICU. It allows exposure to pediatrics but it is limiting in scope like mentioned above. I love it because of the autonomy (no productivity) and many parents, teachers, and parents trust me to get the job done. The stronger these relationships are, the more is gained through the therapeutic relationship. You do have to own being the expert (which you are whether in training or a practicing clinician). You do have to be more of a go-getting because no one is going to hold your hand in this setting (The principal isn't going to tell you what an OT can and cannot do but they can provide educational information). There isn't a doctor's order- you follow the IEP, a legal document, which the team collectively decides what is in it.
I had an amazing level II and got the opportunity to work with inclusion programs, mild-moderate classrooms, and general education. I got to learn how to administer standardized tests such as BOT2, Peabody, School Profile2, VMI, and a few other assessments. These experience helps learning to differentiate normal child development and deviations. Because school is an educational model, it does not expose one self to the medical complication so much. My other fieldwork was in acute care so I felt like I got a good array of experience. One question I would ask your fieldwork coordinator, is how is the mentoring or experience with the specific site? What are past student's review? Did they learn a lot? Placement experience can be a hit or miss. You will pass the board by studying and filling in the gap of the experience you missed. Your level II are important because it makes a strong foundation as a clinician. Go in with an open mind and learn as much as you can. If school is potentially exciting, then go for it. If school doesn't sound appealing, go for something else.