Out of all the royal children, it was rare for someone like Bai Wei — especially at her age — to not have visited The Grave of Soldiers and Kings.
This wasn't a negative commentary on Bai Wei's skill, however. If she went to The Grave of Soldiers and Kings alone, she would have to be at least King class to pass the test.
The test in The Grave of Soldiers and Kings allowed the help of royal guards. Bai King had created a few of the tests to focus on the personal power of the royal children, but most of the tests focused on the collective power of the team.
To become an emperor, a person could not rely solely on their own power. Emperors needed the skill and authority to control others effectively.
The strongest ally that Bai Wei had was her butler. There were some other Marquise and Earl servants and knights in her employ, but Han Sen was her only official Royal Guard.