This sounds like a Police, Fire, and/or Military hiring process.

For example; The test to get hired with my fire department was 2 hours long. 1800+ people took the test: 400 passed.

Then you have to pass a Physical test: 250 passed.

Then there are two formal interviews: 150 passed.

Then the final selection of 50.

After the selection, the candidate is required to pass a 22 week academy. The attrition rate in the academy is roughly 30%

So out of the 50 that start the academy ~35 graduate.

Then you are on probation for 1 full year, where maybe 5 or so are fired for various reasons. That is, once you get past the interviews, the real training and evaluation begins. There is no guarantee that you will have a job until you complete probation.