Good point about the toilets.
I cannot imagine any of our Govs giving such a presentation, though. Are the choices really that bewildering?
You must know how many children typically go to each type of school.
I would start with most popular moving to least popular destination and cover for each the below topics. Start by listing the things to think about (as below), the a list of the local choices, then go thru individually for each school these topics:
General description of types of secondary choices
Admission criteria and procedure (deadlines, exams to take)
Costs (uniform, fees, exCs, bursaries)
Range in attainment of leavers (so avg results but also fate of lowest & highest attainers)
Access (help with transport, distance)
Other types of consideration: SEN support, gender balance, exC opportunities, diversity mix.
I would try to get those covered on one slide per type of school choice.
For God's sake do not say anything too specific about any specific school. Will land you in a heap of trouble.