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That's the main issue, textbooks are not the ideal form of learning for some subjects.

Studies have shown that text is not the ideal format for novices to learn a subject for the first time.

I'm a co-founder at https://www.clutchprep.com and that's what we're tackling. Students go to 300+ student classrooms, don't learn much and then have to rely on a $250 textbook to teach themselves (doesn't work well for most). It's a broken system.

Edit: fixed the link