Come on you students - use your research skills!!!!!
Calculation Books from Pharmaceutical Press.
Introduction to Pharmaceutical Calculations : Judith A Rees, Ian Smith, Brian Smith
Amazon.co.uk: Introduction to Pharmaceutical Calculations: Judith A. Rees,Ian Smith,Brian Smith: Books
Companion book...
Pharmaceutical Calculations Workbook : Judith A Rees, Ian Smith.
Amazon.co.uk: Pharmaceutical Calculations Workbook: Ian Smith,Judith A. Rees: Books
If you are hard-up there are used copies on there.
Good luck.