The beautiful thing about programming (which also makes edtech such an appealing dream to chase) is that you get immediate feedback from the computer and don't have to wait for someone whose attention is at least semi-scarce to mark your paper.

re: Anki. It is not as optimized but you can do SRS with physical flash-cards.

* Have something like 5 bins, numbered 1-5.

* Every day you add your new cards to bin nr. 1 shuffle and review. Correct cards go to bin nr. 2, incorrect cards stay in bin nr. 1.

* Every other day do the same with bin nr. 1 and 2, every forth with bin nr. 1, 2 and 3 etc. except incorrect cards go in the bin below. More complex scheduling algorithms exist.

* In a classroom setting the teacher can print out the flashcards and hand out review schedule for the week (e.g. Monday: add these 10 new cards and review 1; Tuesday: 10 new cards and review box 1 and 2; Wednesday: No new cards and and review box 1 and 3; etc.)

* If you want to be super fancy, the flash card publisher can add audio-chips to the flash-cards (or each box-set plus QR code on the card).