I looked up the Serbian word for “invoice” — račun — four separate times before it stuck. Not because I'm slow, but because I kept meeting it, feeling clever, and then not seeing it again for two weeks. That gap is the whole problem, and spaced repetition is the fix: show yourself a word again just before you'd lose it, and each time the memory holds a little longer.
Published 18 June 2026
Here's the short version, so you can stop reading and go do it if you like: don't review words on a fixed calendar, and definitely don't binge them the night before a lesson. Review each word at growing intervals — a day later, then three days, then a week, then a fortnight, then a month. Get one wrong, it drops back to the short intervals. That's it. That schedule is doing the heavy lifting, not the number of hours you put in.
A German psychologist called Hermann Ebbinghaus ran the experiments in the 1880s: learn something, and your recall of it drops off fast at first, then flattens. Within a day you've lost a big chunk of new vocabulary. Left alone, most of it's gone by the end of the week.
But here's the part that matters. Every time you successfully drag a word back out of your head, the curve after that review is shallower. You forget it more slowly next time. Do that a handful of times, spaced out, and the word basically stops decaying. You've moved račun from "thing I looked up" to "thing I know".
Cramming feels productive because it feels hard. But recall a day later is what builds memory — and cramming skips exactly that step.
For my first year in Novi Sad I "studied" by sitting down on a Sunday and hammering fifty words. Monday I felt fluent. By Thursday I could barely order burek. What I was doing was cramming — packing everything into one session — which gives you a lovely spike that drains almost immediately.
The fix wasn't more effort. It was less, spread thinner. Ten minutes a day beat my two-hour Sunday sessions, because those ten minutes kept landing on words at the moment they were about to slip. Same words, a fraction of the time, and they actually stayed.
First, they make the recall too easy. If you flip the card the second you see it, you're not remembering, you're reading. You want that half-second of "ugh, what is it…" — the effort is the point. That struggle is what tells your brain the word is worth keeping.
Second, they review on a flat schedule — every word, every day, forever. That's a waste. A word you've known for a month doesn't need daily drilling; it needs to resurface in three weeks. Good spacing means you spend your minutes on the words that are actually wobbling, not the ones already solid.
You don't need to build a system by hand, but if you want the principles:
That last one matters more in Serbian and Montenegrin than in, say, French, because the nouns change shape depending on their job in the sentence. A word learned as a bare dictionary entry can ambush you the moment it turns up in the accusative or genitive. Meet it in a real phrase and the ending comes along for free.
Yes, and arguably more than for easier languages, because there's simply more to hold in your head — the cases, the verb pairs, the vocabulary that shares no roots with English. Trying to brute-force all that in cram sessions is why so many people stall out at the intermediate plateau. Spacing is what carries you across it, one small review at a time.
What is spaced repetition? A review schedule that shows you a word again right before you'd forget it. Get it right and the next gap grows — a day, three days, a week, a month — until it's stuck for good.
Is it better than cramming? For anything you want to remember past Friday, yes. Cramming spikes then drains; spacing takes less total time and keeps the words.
How long a day? Ten to fifteen minutes. Timing beats volume — a short daily hit lands on words at the right moment.
The reason I go on about this: Gora schedules your reviews on this principle in the background, so you never have to think about it — you just show up for a few minutes, and the words that are slipping are the ones you see. And because you meet each one inside a real sentence (with a fox happy to say it back to you), the grammar sticks along with the vocabulary. Learn račun once, properly, and you won't be looking it up a fourth time like I did.