Which books for refreshing high school algebra?
Solution 1:
This book, by Israel Gelfand, is perhaps the best book on high school algebra I have ever seen. Written by a leading mathematician, it is short, clear, and concise, yet provides a depth of understanding that you cannot find in many other books on the subject.
Solution 2:
$\text{Higher Algebra}$ by $\text{Hall and Knight}$ is also a good book and has good deal of high school algebra.
You might also want to look at S.L.Loney's $\text{ Plane Trigonometry}$. Since you are going to learn $\text{Calculus}$ it might be important that you know some Trigonometry.