Catch up without starting over
Being behind shouldn't
mean staying behind.
You shouldn't have to relearn a whole semester
to fix one foundation.
Start with the thing you cannot do now.Find the earliest idea that actually blocks it. Learn that. Build forward.
The gap matters more than the grade level.What you need next may come from yesterday — or from something you were supposed to learn years ago.
Catching up should end in being able to do tonight's work.