Some topics are not high volume and you can just memorize them (German states). Some things are higher volume and chunking them into groups would have been better than going through everything slowly and randomly like I did (e.g. the periodic table, despite these cards being pretty well designed in that they offer visual and written mnemonic hooks, as you can see from the images above. And they actually are designed to be learned in groups but I accidentally didn’t do it that way and randomized it).