Medical students, law students, and engineers were using spaced repetition long before it had a friendly interface or a green icon on their phone. Anatomy, case law, formulas - it's the kind of material where the volume alone rules out "read it once and remember it." Spaced review isn't a nice-to-have for these fields. It's closer to a survival tool for exam season.
Which makes it strange how often the tools built for this exact use case end up abandoned mid-semester anyway.
It's rarely the material that breaks the habit
Ask someone who quit a spaced-repetition tool mid-course why, and the material itself is rarely the answer. It's one of two things: making the cards took too long to keep up with the pace of new material, or the review queue piled up during a busy week and became something to dread opening rather than something to work through.
The second one is the quieter killer. A queue of forty overdue cards doesn't feel like "forty minutes of review." It feels like a debt. And the easiest way to stop feeling behind is to stop opening the app - which guarantees you stay behind.
The backlog problem is a design problem
A review backlog builds up for one reason: life doesn't pause for a study schedule. A busy clinical rotation week, a filing deadline, an exam in a different course - and the deck you were keeping up with a week ago has forty cards waiting when you get back to it.
What determines whether people come back isn't whether they fell behind. Everyone falls behind eventually. It's whether picking the habit back up feels like starting over or like just continuing. FSRS-6 scheduling helps here in a quiet way: because intervals are fit to what you've actually retained, not a fixed table, a backlog from a rough week doesn't cascade into permanently inflated review counts once you catch up - the schedule adjusts to where you actually are, not where a calendar assumed you'd be.
The backlog isn't a sign you're behind on the material. It's a sign the review system didn't survive contact with a busy week.
Capture without falling behind on capture itself
The other half of the problem is upstream of review entirely: getting dense source material into cards in the first place. A semester's worth of lecture slides, a stack of case briefs, a textbook chapter with forty terms in it - typing each one into a flashcard by hand competes directly with the time you'd rather spend actually studying.
Bulk-pasting a list of terms and definitions turns an hour of card-building into the time it takes to paste. Cards that point at a real source - a textbook page, a slide, a photographed diagram - skip retyping the passage at all; you review from the actual page instead of a version of it you copied out by hand. Images work as either side of a card too, which matters for material that's genuinely visual: anatomy diagrams, circuit schematics, a scanned page of case citations.
None of that makes dense material easier. It just keeps the friction of capture and review from becoming a second problem layered on top of the first one.
Two related reads: how many flashcards to review per day is about keeping intake matched to the time you actually have, and what FSRS is explains why the schedule adapts to a rough week. If you study medicine or law specifically, there are pages for medical students and law students.