I found these C3 Solomon homework sheets and solutions and some other resources - really useful for more practice. They are specifically designed for Edexcel but will be useful for other exam boards too.
Here are the links - I hope you find them useful!
SOLOMON WORKSHEETS
http://glynmathsalevel.wikispaces.com/C3+Solomon+W...
TOPIC ASSESSMENTS
http://glynmathsalevel.wikispaces.com/C3#C3 Topi...
REVISION WORKBOOK