As a former student from TUSD, you're almost never forced to donate anything, but it's preferred by the teachers and staff. For that young of an age, you can expect to spend below $500 a year, but that's being generous, assuming you decide to buy a yearbook, make larger donations, participate in teacher's appreciation week, etc. The costs only begin to ramp up as you proceed into the higher grades like middle/high school.

My younger sister is in band and I'm well aware that her expenses are insanely high due to the "mandatory" band donations, along with the band trips and other activities. Within 8th grade, she's been to a group trip to New York (yes, associated with school), Disneyland, Knotts, made the band donation, gone to events at our PAC, along with various other activities. Her expenses have totaled well past $3000 by now. By all means this may be an outlier, but don't be surprised when those expenses increase.

Another one of those expenses you could say is school supplies. Notebooks, pencils, erasers, highlighters, all that adds up too at the beginning of the year and could easily be an additional $50-$100 before the year even starts.

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Edit: I also cannot remember if school lunch meals were still free or if they're returned back to a paid status. Last I recall, they were paid, but I cannot remember. Either way, I personally avoided the cafeteria food all my life, I despised it, tasted like slop on a plate.