Personally, I used the Self-Study quite a bit [Userscript] Self-Study Quiz
I mostly used it to review failed items a little more and leeches (there are some additional filters available somewhere in the api section as well). I’m not that bothered to “over review” something. (e.g. some people are worried if they use the self study script shortly before doing normal reviews) because it will sort itself out eventually and I just feel like I currently need some more time on some items.