First thing, give the schools enough money to buy proper IT equipment and hire at least one person who does IT full-time per school so that the CS teachers or whoever runs the school's IT infrastructure doesn't have to worry about it at all times.
(Hopefully, the ban on cooperation here in Germany will be lifted and the federal government will be able to subsidy all schools at least financially in that aspect.)

Then, educate all the teachers, for fuck's sake.
It is sad to see an otherwise good teacher in a technical subject at a technical college struggle with the basics. Teachers should have continuing education in computer science and also should be comfortable working with technology.
There are some good CS teachers and some who're also nerds but they can't fix everything nor educate every colleague. Unpaid and in their free time, mind you.

Then, update the learning materials for CS. I've seen/worked with some of what is used in schools today and it's definitively not worth the money but it has to be bought anyway. At best, education materials should be open-source so knowledge can grow and be updated more quickly.

Also, don't rely too much on big cooperations just but cause they offer you shiny materials and discounts.