@kronix
The romance is in-universe forced, the drama is driven by the conflicting incentives for performance in the class, and all we know about the MCs' crushs' behavior in the test is based on the assumptions of the MCs.
Are they failing because they're being faithful? Are they failing because one or both are incapable as romantic partners? Are they failing because they lack chemistry? Are they failing because they're diving headfirst into NTR and they're making sure they don't get split up? Are they failing because they're actually conspiring to make the MCs interested in each-other/someone other them them?
We just don't know because the four of them having discussions about what appears to be THE most important thing in their lives at this point (at least the MCs' lives, anyway) would let this move on from ongoing paranoia about NTR to addressing the nature of their relationships.