TITLE: Good calculus exercises/problems?
QUESTION [15 upvotes]: I can't enroll in a university this year, so I'm studying calculus at home, but the only exercises about calculus that I find are the easy ones. Do you know a great page where I can find not only calculus exercises, but problems as well?
I want to find about:

hard limits, 
derivatives and integrals, 
and some problems

REPLY [4 votes]: Try this book
B. P. Demidovich: Problems in mathematical analysis
There are lots of exercises that are hard and beautiful.