Assessment Center
The good news was, as Lex understood it, that he was in an academy, so he could finally undergo a systematic learning of cultivation. The bad news was, he was either expected to be a student, or work to somehow contribute to the war efforts of the nation.
He wasn't against contributing per se, but that would likely make it harder for him to gather large amounts of energy for the system. Speaking of which…
Lex opened the system and was surprised to find that it looked quite different. Not only were there many more options available to him, but the system was much more flexible in how it operated. This meant that, for example, if Lex wanted to start a service that wasn't officially offered by the system, he could have the system design it.