^Yeah, for what it's worth I'd imagine it's exceedingly difficult to start two very categorically different pursuits simultaneously.. even more so if both of those would normally take up a significant amount of your time and attention like academics and idol training/activities. Aside from the most intense of the overachieving sort, people would usually focus on one side first and only attempt to multitask after they've gotten the hang of it somewhat and managed to fine tune their time management around it.
The other members who went to uni have that advantage of experience while Yuka unfortunately doesn't. Yet.
That option is always open for her (and any other aspiring young members) should she want to take it in the future, I hope