Management Theory and Practice
The best textbook for Advanced Higher. Don't buy it for Higher.

Contains extra info and will help you to consolidate the key areas of The Management Context. Goes into great detail on management theorists, strategies, and the different schools of management. Expensive, but believe me, well worth it.
£31.79 from Amazon.co.uk

Business Studies - Hall, Raffo and Jones
This is a cross between a textbook and revision book. You've got key points on all aspects of the business world, case studies, and questions. You've also got a glossary at the end of each section.

Very useful, but originally published with the English system in mind.
£0.01 Used & New from Amazon.co.uk

How to Pass Higher Business Management
This book combines an overview of the course syllabus and exam requirements, as well as a guide to revision techniques and advice on sitting the examination itself.
£8.99 from Amazon.co.uk

Intermediate 2 and Higher Business Management Course Notes
As pained as I am to promote a book published by Leckie and Leckie, this is probably the next-best-thing to the notes available on HSN. Good for 11th-hour revision, but not much else.

Vague in places, too specific in others.
£0.01 Used & New from Amazon.co.uk

Business Management Higher SQA Past Papers
Good, but expensive for what you get.

You obviously need to use past papers as they're the closest thing to the exam itself, but the book is expensive for what you get.
£24.91 Used & New from Amazon.co.uk