What prevents the teacher from giving his class all the answers so that he doesn't have to work and doesn't get fired for his students grades being too low.
I remember hearing about a school where the teachers assigned a letter to each corner of the room and would stand in the corner of the room that corresponded to the correct answer to each question.
In Atlanta they were having "grading parties" where teachers were getting together on the weekend to erase incorrect answers and fill in the correct ones. They got sloppy.
ITs ok, this types of train wrecks have their own logic - after a while people will cotton onto this part, and then there will be spot checks to ensure that students aren't being given the question paper.
After that they will realize that all tests should come from one standardized system, lets say Pearsons.
Then pearson will conduct tests for all 10th graders and then all high schoolers and so on.
Kids will start spending time coming up with creative ways to cheat and beat the system.
Its happened before in other countries and will happen again.
At the end of this, expect people to enter the test center after going through a metal detector and removing any metallic object.