Why does one, upon incorrectly answering a question, suddenly find that their little points bar drops a substantial amount? This is very aggravating and quite annoying.
Yes, that is how you get more practice on the section you are having trouble with. Previously you had 3 hearts and if you missed three questions you had to start over the whole lesson. Now, you can miss many, but each time you miss one, it does go down and each time you are correct, it goes up. If you are missing very many and it is taking a long time to pass the lesson, then maybe you might want to redo the lesson instead.