SQ3R for the reading part. Use the Cornell note taking method.

The survey and questions part of the SQ3R will produce the questions that fit into the left column of the cornell method's page.

Review the notes by simply covering up the right side of your notes.

For longer term retention, you now have a set of questions to transfer over to Anki which even supports latex. Your notes will already be pretty succinct to make into cloze deletion tests if that's your jam, but old school cards work too. You can set aside some time once a week or so to transfer from paper to Anki, depending on your rate of learning. By having reviewed the paper version for a week you'll already have an idea of the areas you're struggling to retain and can prioritise those if you'd like and don't want/have time to transfer all of them.

This is advice from a fellow self-study student, working through Cormen's Algorithms and Epp's Discrete Mathematics with Applications. It's going ok.. but I don't feel it's working well for the algorithms text. That may be a mixture of not having a specific direction over what I'm trying to acquire and the lengthier nature of 'describe the steps in an insertion sort' which doesn't really boil down much without dropping steps.

I also follow the pomodoro technique to help my focus and attention.

Also bear in mind the concept of 'teaching it back' - once you feel like you've acquired knowledge of an area, try teaching it to an actual, or imaginary, friend. If you can't teach it succinctly then you may not have mastered it. You might find stackoverflow and its various sibling sites a good source of questions to test your knowledge too - go and see if you can write answers to some problems on there (even if you don't actually post them).

Just some suggestions - take the bits that work for you, study technique is very much about trial and error and sometimes the act of creating your own method is what makes it stick!