Students cycle through several academic and developmental transitions in their K-12 journey.  Effective teachers know that we have to prioritize supporting them through these transitions, particularly academically.  We have to build academic soft skills, be intentional about bridging gaps, give clear feedback based on mastery, and set clear expectations.  We can't  simply say "the best of luck" or set up false impressions of academic performance.  These things can cause significant damage to students in high school.