I've been enjoying reading Krupskaya's works on education and how to study (e.g. How Lenin Studied Marx). I'm wondering if there's anything similar in the Marxist canon (or just worth reading for Marxists in general) on the subject of study and self-education. I'll try to compile the Krupskaya I've been reading in an edit.

edit:

The Organization of Self Education

General Rules for Independent Study

How Lenin Studied Marx

Unfortunately that's all I could find online