I think Marriage should be taught in school. And it should be noted that it is a serious commitment not to be taken lightly. One should understand that it is NOT disposable and that one should understand how the shechina suffers when there is a lack of shalom bayis and when a couple destroys a family and breaks up. Also it should be noted that when a person marries without a true commitment to build a life forever, they steal an opportunity from someone else to build a life with the other person.
Kids need to be taught how to choose a partner for the right reasons and not for the reasons others are choosing. Kids need to be taught to marry for the marriage and not for the excitement of the wedding. Kids need to be taught that marriage is real work and without the work necessary and the understanding necessary from each partner you can’t build the foundation on which a committed successful marriage and family can thrive.
This has to be taught before the shidduch and dating process. This has to be taught before the fun begins. Finance and budgeting and the reality of managing on your own needs also to be taught because that becomes a rude awakening.