Keep your standard textbook for the theory, then dive into Demidovich for the "workout."
The philosophy is simple: To master it, you don't just read about it; you do it until it becomes muscle memory. The "Demidovich Grind" demidovich calculus
The book provides the answers in the back, but rarely the solutions. You are forced to struggle with the "how" and the "why." Keep your standard textbook for the theory, then
The collection contains over 4,000 problems. It starts with the basics of limits and moves through differentiation, integration, series, and multi-variable calculus. However, unlike modern books that provide a few "challenge" problems at the end of a chapter, Demidovich is almost entirely composed of challenge problems. It starts with the basics of limits and
Most modern calculus textbooks (like Stewart or Thomas) are designed for readability. They use colorful diagrams, real-world examples, and a gentle progression from easy to medium difficulty.