Others have gone into explanations about the text scenarios that usually happen during the school day and that are tied to parenting skill. I would also say that it adds more activities throughout the stages of growing up and it pairs well with the other family content. Admittedly, I don't really make delinquent kids. I skew strongly towards happy, functional and productive future sims so the pack goes with my playstyle. I do like making them all a bit different so I don't try to max out every character value for every child sim.
This pack has young sims doing things like volunteering, writing in journals, listening to music to calm down and some new social interactions that build or reduce character. They can also set the table which is a way to actually make sure that sims sit down for a meal together. It's a good idea to set the table for a holiday meal, for example.
I would say it is somewhat open-ended because you can take different interpretations of how parents should encourage children to turn out depending on what you emphasize with the character values. You can opt for a strict parent encouraging responsibility or a more lenient friendly parent who is in-tune with a child's emotions. You can instead go for raising ill-mannered, cursing brats if you want. I haven't so I don't know what it is like but you basically wouldn't correct them and wouldn't encourage any manners or responsibility or emotional control. Also, getting in arguments and doing mean interactions will make kids or teens "worse".
Not mentioned by anyone else I think, is that this pack does offer some interactions among adult family members after children have grown up. They have new social interactions with their parents and siblings such as "deep personal conversations" and "give family advice". I use these a lot to continue the sense that sim family members know each other and are close even when they have grown up. It distinguishes families from random sims. Again, you can combine it with other childhood or family-oriented packs and you end up with ways to differentiate families from each other. I would say it pairs with Kids' Room, Backyard Stuff, HSY, and obviously now, Growing Together. You end up with various activities that individuate kids & teens.