I don’t have an answer to your question, but suicide isn’t that simple.
Bad things can happen to people, and they would never consider suicide. Good things can happen to people, but they still commit suicide.
I don’t think people always know exactly why they’re suicidal. They might believe it’s because they didn’t get into the dream university or failing exams. It might be a triggering factor, but not the full story.
I don’t believe there’s a checklist of things to do and not to do. Why a person might end up in suicide is entirely personal.