A POLITICO examination of hundreds of pages of privacy policies, terms of service and district contracts — as well as interviews with dozens of industry and legal experts — finds gaping holes in the protection of children’s privacy.

The amount of data being collected is staggering. Ed tech companies of all sizes, from basement startups to global conglomerates, have jumped into the game. The most adept are scooping up as many as 10 million unique data points on each child, each day. That’s more data, by several orders of magnitude, than Netflix or Facebook or even Google collect on their users.

Students are tracked as they play online games, watch videos, read books, take quizzes and run laps in physical education. The monitoring continues as they work on assignments from home, with companies logging children’s locations, homework schedules, Web browsing habits and, of course, their academic progress.

A report by McKinsey & Co. last year found that expanding the use of data in K-12 schools and colleges could drive at least $300 billion a year in added economic growth in the U.S. by improving instruction and making education more efficient.