The National Parent Forum for Scotland have produced new Revision in a Nutshell guides for the new Highers (20 subjects) and updated Revision guides for National 5s (20 subjects).

These revision guides contain direct links to SQA specimen question papers, exemplar question papers plus past question papers, where appropriate. They are designed as digital resources and work well with iPads or other tablets.
The guides advise learners to check with their teachers to make sure that material is relevant. The guides are primarily intended to provide the SQA direct links by subject in one place, and to give some additional revision opportunities (if relevant) which are web-links to school pages or to the websites of subject-relevant organisations.

20 Revision Guides for the new higher qualifications
http://www.npfs.org.uk/new-higher-revision-guides
20 Updated Revision Guides for the National 5 Qualifications
http://www.npfs.org.uk/national-5-revision-in-a-nutshell