I'm a business student, and I would actually recommend you to go to this website:
http://www.dineshbakshi.com/igcse-gcse-business-studies.htmlIt's quite good. Hm, other than that site, you could always try studying more than what's offered in your textbooks. Like me, I'll be sitting for the business exam in May 2010 for IGCSE, and I'm also reading up A Level Business Studies textbooks for additional information. Doesn't hurt to learn more
You need a good, strong foundation for business studies. Keep practicing past year papers, reading through examples of good answers, and keep at it. I view Business Studies as case studies which requires understanding of the text, strategies, skills (ability to convince the examiner as to why your suggestion is a good one), and of course, knowing the business terms.
Try doing challenging mind puzzles or brainteasers. They help 'circulate the blood' in your head, lol.
Don't panic. Be patient and calm, and take it slowly.
Don't force yourself or push yourself too hard.
Hope I've helped.