Guys, doesn't it mean that Florentia is more worthy than the other kids, to be in his class cause like, the explaination of their 'class' isn't to make them 'study', they do study but the most important part is how they are in class or how their brain works..... ╮( ̄▽ ̄)╭ correct me if I'm wrong, no need to be harsh.
Basically, it is like this. To expand it further, any children in the family are given the chance to be tutored at a young age, and most of them started at 8 or 10, but Tia started at around 5 since her grandfather noticed her holding a complicated book that children usually had no interest in reading and suggested to Clerivan to start having Tia in class.
These classes are where Clerivan would observe the children, seeing, as a Lombardy, how they would apply to business settings and take opportunities when seeing one, as they are a business related family. So, yeah, technically, it is a test to see who is a worthy successor, and who would carry the Lombardy name proudly. You can easily see how Tia's grandpa favors her when he invites her over for dinners and gives her presents or requests her for tea while other kids don't seem to have the same chance, right? This is because Tia has shown on one more occassion how she takes pride as a Lombardy, like with the prince situation, and won't bow to anyone, knowing they can stand on their own without being threatened by royalty.
Her grandfather has already seen her as worthy when he noticed how talented people seem to flock to Tia, or that she gives opportunity to the right people, while Clerivan has noticed a few things but what really made him realize how clever Tia was is when Gallahan mentioned that he wouldn't know how to proceed if Tia hadn't mentioned going to Clerivan, and that had Clerivan thinking that Tia, a child who is less than 10 years old, have been indirectly involved in the family's business venture and has somehow influenced its success by her little comments? So, now, this is what happened. Hope you understand it, I had a lot of tangents there.( ̄∇ ̄")
I nearly screamed after realizing what Clerivan meant