Hello! I have a test in two weeks for a Mathematical methods course, and the teacher likes to use very tricky problems. My calculus is a little deficient, and I need to practice a lot. I'm currently using both Boyce's and Spivak's Calculus books to do exercises, but I'd like to find a source of problems that give explained solutions, similar to what they do on intmath.com. My background is in pharmacy and biology, and reading math textbooks is still a little hard for me. Any suggestions would be appreciated.