The money to pay for the tests and the test preparation materials comes from the LAUSD budget funded by our taxes.
In order to pay for the tests, LAUSD must:
Increase class sizes;
Lay off school counselors, librarians, support people, custodians, and office clerks;
Cut art, music, sports, and gifted programs;
Reduce teacher salaries and health benefits.
If there was only one test per school year (and one is all you need), just imagine how rich the schools would be with staff and programs; and how complete the education would be without the extreme pressure on the teachers and the students to continually raise tests scores. Unless the district used the money to hire more administrators.