[[Spaced Repetition]] is an incredible tool / approach / Resource for solidifying information into long-term memory. This is very helpful for those with ADHD who have poor working memory, students who are trying to learn lots of information, and anyone who really just wants to remember more of what they learn.
Forming Knowledge is the name of the game and these tools / approaches in and around [[Obsidian]] will help you do that.
One tiny nitpick: poor working memory is not really improved by spaced repetition. SR solves a different problem, that is, long-term retention. For improving working memory you should look into N-back, here’s a very good intro to the subject.