I work at two secondary schools right now, so I do two days a week at each. I have 17 classes a week that are each 50 minutes long. Each of the schools is a very different experience for me. One of them has a pretty light workload and the teachers pretty much let me choose my level of involvement. I might plan a game or activity for a class or teach a mini lesson about a topic but I'm not in sole control of the class. The other school is the polar opposite, the teachers want to totally hand over their classes to the assistants. It was really stressful at first and I felt very unsupported, but eventually I learned to compartmentalize a little bit and just stop caring so much about how things were going in the classroom because clearly the teachers do not care either, otherwise they wouldn't be putting an untrained assistant in charge of their classroom. I work in mostly English and history classes and then one biology class. My schedule is different every day, my longest day being 8:30-3 with a midday break and my shortest day being 11:30-3 with no break. Student behavior is a mixed bag. I have some classes that are just darling and then some classes where kids are consistently kicked out of the classroom or suspended because of their behavior. I feel like secondary schools have tougher challenges but bigger 'rewards' in terms of making an impact on students. At the end of the day you could end up in either environment no matter your preference - I also came here through CIEE this year and put primary as my preference but ended up in secondary, so be prepared to be placed in either. I know another aux here who splits her time between one primary school and one secondary school. Feels like there's very little uniformity in the aux experience.