ahmadmz said:
I have never did differentiation/integration before. I think I will study calculus for about a month before starting physics. I'll give Spivak a try since I heard a lot of good things about it. If it becomes hard to understand I plan on getting Calculus made easy by Silvanus.
Spivak and "Calculus made easy" sit on opposite side of spectrum from each other. Spivak's
Calculus is a proof-oriented and mathematically rigorous textbook that is targeted for students who are interested in pure math. Therefore, this is a very challenging textbook for someone who's learning calculus for the first time. I've heard this is a good textbook as well (I've never read it, btw), but you need to put a lot of work to learn from this book.
On the other hand, "Calculus made easy" looks more like a study guide rather than a textbook. It might be a good introduction of calculus, but it is nowhere as deep as a standard calculus sequence. It seems like it's targeted for someone who's taking calculus right now and having a great difficulty, or someone who wants to understand a little bit about calculus (some basic nuts and bolts, and nothing more).
I don't know how much calculus you want to self-study, but you need to understand that those two books are for completely different types of audiences. If you're going to study physics, however, you need a lot more through book than "Calculus made easy" such as any standard first-year calculus textbooks like Stewart, Larson, and etc.
Just out of curiosity: Why are you self-studying calculus instead of taking a calculus class?