PSTF

PSTF (Prais Specimen Testing Facility) is a testing facility owned by the Prais Government and is located in the Iberi District in the south west of the country. It is quite big, grazing 1 hectare of land and 2 buildings each with 4 floors. These 2 buildings are the dorm and main facility building. Its goal is to experiment with the children, or are also known as Specimens, that were kidnapped from the Execute Dawn genocidal event. They are sorted by tests then put into categories and ranks that suit their abilities, they are ranked based on a system called Scorers. this system is deemed to be useful to Prais, helping them produce and pick the best Sacher Users and Sacher Mutants to be used in the Sacher War.

Pre-Execute Dawn
PSTF was created in 907 by the Prais Government to provide Prais with Human-Modified Weapons to use in the Sacre War against Rotamm. The Human-Modified Weapons technology was just recently invented and tested, it was immediately deemed to provide good use to the Prais in terms of war, many people already claiming it to be the winner of their war and the main weapon to exterminate those who disagree with the White Ideology. However, the Prais Government refused to use sacrifices or candidates from their own people to create these weapons. Yayak Kikka, Prais' Minister of Science and Technology, proposed an idea to capture all the kids aged 12 to 17 that are living in the 9 districts of the pre-initiated Execute Dawn genocide, the genocide that is set to officially initiate and broadcast the war between the two nations. This idea was accepted by the Führer and initiated, kids that age had to witness most of their family murdered in front of their eyes and were forcefully kidnapped by Prais officials.

Tests
These kidnapped children were classified and labeled based on their districts, name and numbers. These labels were called the code names. These code numbers are written like nX00, n labeling the number of their district, X labelling their classification, and 00 labeling the digit they were assigned to. Then they are forced to do tests that are both physical and logical. Those who fail these tests (get below 50 in score/fail to do physical activities) are immediately killed off on spot. The tests that are mentioned or known are the: gun test, mathematical test, and logics test (there are rumored to be more).

Gun Test
The gun test is shown in the very beginning of the story through Vier's short dream of her past. It was the first test they were forced to take. These kids were forced to line up and take turns to hold a gun, the objective of this test is to be able to shoot a target with a gun, it doesn't matter where it hits the target, if it does, the shooter will immediately pass, if it doesn't hit the target whatsoever, the one taking the test will be immediately shot in front of the crowd. There was also a situation in Vier's dream where a kid refused to hold the gun, he was murdered for his cowardice and also humiliated for his act.

Mathematical Test
The mathematical test is a simple counting test based on paper. This test was mentioned and discussed by Neun and Upsilon after their escape from PSTF. This test's basic is simple however there is a trick behind this small test. The test takers are asked to do simple and intermediate mathematical problems that suit their ages, they were also asked to explained on how they solve them. An example of the questions could be explained similarly to: what is 1 + 1? And why is 1 + 1 = 2? The scoring was relatively small on solving the mathematical problems, the scoring depended more on how the test taker explains their work. The test had 50 questions, half being normal answers to mathematical equations and the other half on asking them why. The score to pass is 50%, however 30% only accounts for the answers of the mathematical problem, and the 70% accounts for the explanation. Upsilon, with her goal of passing with an average score, answers only 35 questions, 25 being all the normal questions, gaining a 53% score. This test accounted to the children's logic score.

Logic Test
This test is a simple logic test that had around 50 questions and is based on paper. This test was also mentioned and discussed by Neun and Upsilon in the same scene. This test had no tricks behind it, it took place after the mathematical test and the gun test where most children were wiped out. The score to pass this was 50%. Upsilon with her same goal of getting an average score managed to get 25 questions right and the others purposely wrong to exactly pass. This test accounted most to the children's logic score.

There are supposedly more tests other than the 3, however these weren't mentioned.

Classification
The test scores were entered and the children left alive were the supposed new Specimens of the PSTF and gained the right to live there until they graduate by the age of 17. The children who have passed are classified into 3 different groups: Top Scorers, Normal Scorers, and Special Members. The Top Scorers and Regular Scorers are defined based on the test scores, while the Special Members are picked based on race. These Special Members are kids or Specimens that have a high place in the Castes, this was decided by an interview of their background and prominent features such as blonde hair and blue eyes.

These 3 groups would determine what will be done to the Specimens right after the tests. According to Upsilon and Neun, the Regular Scorers are then infused with a type of red liquid that was supposed to erase their memories and give a coded amount that will determine the size of their Sacher Mutants in the future. This same liquid was given to the Special Members, however the memory erasing code inside of the liquid is erased, these Special Members were told that the liquid is to ensure them not to turn into Sacher Mutants in the future, however that was a lie.

Structure
The structure of PSTF varies

Top Scorers
Top Scorers are privileged Specimens in the PSTF and they have more rights and privileges than other Specimens, they receive a title and have more power than the others, they have the rights to more ration of food and water, more rest time, better health care and are more tolerated for their bad or destructive actions. There are 10 Top Scorers in each batch of the Specimens, these Top Scorers are divided and classified into two branches, the Logic and Stealth branches, each with 5 members and ranked 1 to 5, this is a different case with Vier however, who managed to rank number 1 in both categories.