Part III: Socialism
Chapter V. State, Family, Education
Engels: for «transformation of private domestic work into a public industry”
Marx: “producing fully developed human beings”
Hence: education should be:
1) public, not private affair,
2) harmoniously developing body and mind, practice and theory.
In "Marx and Engels on Education ", by Colin Waugh, we read:
"Combination of education with industrial production"
This is from "Communist Manifesto". It implies that education should be practical. That it should be relevant to life practice.
In addition to mental and technological education, Marx and Engels also stressed need for military training.