How schools buy and use computers and tablets varies greatly, but in particular between different countries. This is evident when Future Source Consulting publishes new statistics on the sector for 2016.
Future Source has unfortunately only data for the United States and "the rest of the world", but it is numbers that may be of interest.
In the US, Apple's market share fell from 25 (6 Mac / iOS 19) to 19 percent (5/14) between 2015 and 2016. In 2014 it stood at 34. unmarked Windows market share has also declined slightly, while Android has always had a non-existent share. Chrome OS is the big winner, and have gone 38-50 to 58 per cent during the same period.
Outside the US, Windows has been very strong forward and had in 2016 a full 65 percent of the market. Android started on strong 36 percent in 2014 but is now down to 17 percent. Chrome has risen from 2 to 6 percent from 2014 to 2016. Apple's market share has almost stood still – Mac low of 2 percent in both 2014 and 2015 but fell to 1 percent in 2016. iOS fell from 9 to 8 percent in 2015, but rose again to 9 percent in 2016.
in many countries, it seems therefore that schools prefer ordinary PCs for their students, while the US schools are increasingly betting on Chrome OS and presumably respective Chromebook for each student.