Many times it’s the home and local yeshiva and environment that create the battleground for our young people.
There are a number of very good frum regular “out-of-town” (non co-ed) high schools that are not as judgmental as “in-town” schools and give teenagers a lot more breathing room. Many parents of At Risk Teenagers have gotten their children back along with their happy faces as a result of the success of these schools.
By the time teens are at the “At Risk” level, parents should be more concerned about gaining the trust and happiness of their child, than the child’s frumkeit. You can’t be a frum Yid without being happy. Ivdu es Hashem b’simcha.
I heard from a renowned Rav that teens at the “At Risk” level are probably not m’chuyiv in mitzvos anyway.