Cambridge University Press who publishes the Study and Master textbooks have put together a set of free worksheets and information packs. All answers are provided with the worksheet packs. Study & Master Support packs are available for the majority of Grade 12 subjects. Visit the Grade 12 Support Pack page.
They are also providing schools, teachers and learners free access to a range of CAPS-approved Study & Master e-textbooks and selected resource materials via the Cambridge Elevate and Cambridge HOTmaths digital learning platforms. See their website here to find out how you can get access:
http://cup.co.za/pages/cambridge-digital-content-caps
Support packs: (https://www.cambridge.org/za/education/support-packs)