Certification isn't very difficult; as long as you can operate the mecha to complete the specified maneuvers, you can pass the certification.
Si Lingle and the others passed the certification and became F-level Mecha Masters.
After the certification, they also bought F-level mechas at the certification center.
All five of them purchased lightweight mechas; heavy mechas are clumsier, and they find them more difficult to control.
Since they didn't have mechas themselves, they could only purchase them in the Star Domain.
An F-level mecha in the Star Domain costs 100 gold coins each, and even if it gets damaged, Si Lingle and the others can still afford it.
The mechas in the Star Domain are digital, which is why they're so cheap.
In the real world, an F-level mecha would cost at least thousands of gold coins per unit.
Of course, they have money and can buy better mechas.
