Michel Thomas is the answer (or it was for me anyway as someone previously TERRIBLE at languages)
BBC made a documentary about him where he teaches a French gcse to the 6 worst kids in the school, in I think 2 weeks. https://youtube.com/playlist?list=PL94A517B00A16C187&si=4eAv...
He was also in the French resistance, survived concentration camps and is generally a very interesting person.
His successor is https://languagetransfer.org, which is just a labour of love by a genius polyglot and language teacher.
So much so, in fact, that the owners of the Michel Thomas IP tried to sue him for stealing the methodology. The EFF, back when they actually did anything, shredded them.
https://arstechnica.com/tech-policy/2018/07/no-you-cant-pate...
Please check Language Transfer out and support him how you can.
I _loved_ Language Transfer when learning Greek. I haven't used it in many years, but at the time remember that I went from just being able to say "Hi" and "How are you" and "Good" to speaking full sentences with my boyfriend at the time in one day. And when visiting Greece later that year I could get by with strangers in everyday interactions easily. It was a mind-blowing learning experience, as someone who is not highly gifted in languages, and I donated to the LT creator.
Now I am learning Swedish. It has been taking me _way_ too long and unfortunately LT doesn't have a Swedish course. Looking at one of these documentaries about Michel Thomas it does indeed look like exactly that kind of approach! And I see he has a Swedish course. I'm excited to give it a try!
> Occupations Nazi hunter
Amazing
The other amazing thing is that all the recordings of him are done with two random people they just dragged in and did on the fly.
They seem so perfectly weighted and with exactly the right increase in difficulty that I assumed they must have been heavily edited / selected.
But basically he kept his methodology secret - literally locked in a safe - because he didn’t trust anyone after his experience in ww2.
It wasn’t until he was really old that someone convinced him to make the recordings. And the tapes are just that.