All potential CHERUB agents are rigorously vetted. Only candidates with a high probability of qualification will be brought to CHERUB campus under sedation.

There are two categories of tests when potential recruits arrive on campus:

(1) For recruits aged under 10.
Potential red shirts undergo a detailed medical examination which typically lasts around three hours.

Strength, endurance, coordination, speed and eyesight are among the systems tested.

After the physical tests, recruits aged 8 or older are usually asked to sit a written exam. The intelligence of younger recruits is gauged through informal observation and play.

(2) Recruits aged 10-12 years
Recruits aged 10+ are expected to enter basic training within a few months of arriving on campus. After a medical examination they undergo a day long series series of challenges designed to test mind and body to the absolute limit.

Any kid who breaks down during this testing is highly unlikely to be able to last 100 days of basic training.

Customization
Recruitment tests are designed to explore a candidate's known strengths and weakness.

For example, a candidate who is scared of heights may be asked to jump from the highest point of the obstacle course.