Spaced repetition is extremely important to me.
I tend to forget the reviews though, so I sometimes put it in my calendar to remind me. I usually just recall the memory palace I used.
For example: I had to learn what the different departments of the Swiss Federal Administrative Court are responsible for.
Here‘s the facts:
Dep. I = infrastructure, environment, taxes, Federal Intelligence Service, personnel
Dep. II = economy, business competition, education
and so on for all 6 departements.
So i memorized in a palace exclusively for this subject:
There‘s a candle (for the dep. I) and on a train, next to it a tree where the leaves are falling off, someone takes money from others, some co-workes just standing around and a guy looking like a spy hiding and listening to what the people are saying. That‘s it for the first departement.
II = a swan (2) looking at a graph, behind him are two people in a tug war, and a student with the typical black robe throwing the hat in the air (don‘t know if that‘s just in american movies but it‘s what comes to my mind when I think about education xD).
I review that in my memory palace and try to think of the exact meaning of the things I had to learn so I can be sure that the images are useful.