REA’s Essentials provide quick and easy access to critical information in a variety of different fields, ranging from the most basic to the most advanced. As its name implies, these concise, comprehensive study guides summarize the essentials of the field covered. Essentials are helpful when preparing for exams, doing homework and will remain a lasting reference source for students, teachers, and professionals. Calculus I covers functions, limits, basic derivatives, and integrals.
I thought this was a good book overall to help you get the gist of calculus, I would more so recommend it for people who need a refresher as opposed to someone seeing and learning it for the first time. This is because the formulas sometimes lack explanations for what certain variables (in the formula) mean. It did definitely help refresh my memory!