Go to the site and go to unit 5. This site does a good review of polynomials.
At this site scroll down to the algebra section and then you'll find adding/subtracting polynomials or multiplying polynomials. In each of these sections there is a good explanation as well as some worksheets and on-line practice.
At this site scroll down to the beginning algebra topics. Here you will find all the operations with polynomials.
Create your own worksheets. Click on the topic you want.
At this site you can find all operations with polynomials under the patterns and relations.
Notes on skills with polynomials with examples.
Pages 15 - 22 Pages 49 -66

Algebra Skills
Pages 25 - 38