Calculus in 20 Minutes
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I am learning calculus from this book on my own. It's great if you already know a lot of logic.
Plus, calc 1 was a breeze, calc 2 is where the brain-pain started.
Calc 1: Differentiation up to the Chain Rule, with applications like maximization problems. Basic integration, up to the Substitution Rule.
Calc 2: More-difficult integration techniques (integration by parts, trigonometric substitution, partial-fraction decomposition), infinite series. Most people find Calc 2 the toughest because of the infinite series.
Calc 3: Multivariate calculus, partial derivatives, lots of 3D stuff. Easy, intuitive, spatial.