I don't think it's like Notes on A Scandal, as that is more the story of a senior teacher's obsession with the life of someone from a different (social) class and what she sees as the younger woman's sense of entitlement. The 'affair' with the pupil is almost secondary to the story of Barbara's obsession with, resentment of and possible sexual interest in Sheba, and her self-appointed role as moral guardian to younger women.
So far, unless the role of the other staff members becomes more obvious, that is not the case in Teacher. The main character is flawed, but most of us are in different ways, and the viewer is being asked to consider whether Jenna's presentation (low cut tops, short skirts) and lifestyle (heavy drinking, visits to nightclubs frequented by schoolkids) suggest that she might be capable of committing a sex offence, and if so, why we might think like that. Similarly, it asks whether the fact that the boys are boastful amongst themselves and given to sexually inappropriate remarks to their teacher (both in school and in the nightclub) mean that their word should be taken as gospel, or if their youth and vulnerability should protect them in a way that might not have been questioned if they'd been girls.
Those questions are layered onto the central one of how far people are responsible for something that happens when they are drunk (I would say 100%), and how far they can get a fair trial when they can't defend themselves because of memory loss (much more difficult to quantify).
I think there are a few times when the plot wanders into daftness (eg when Jenna leaves the Community Service session to run after Kyle), but on the whole it hangs together well. We are finding out what happened at the same time as Jenna, so it's been a bit disjointed at times, but not so much that we can't follow the story.
I am interested to find out what happens, and at this stage I don't know whether I think she is guilty or not.