The CIE/Cambridge IGCSE accounting past papers can be found here : http://www.xtremepapers.com/papers/CIE/Cambridge%20IGCSE/Accounting%20%280452%29/
The CIE/Cambridge International A and AS level past papers can be found here : http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Accounting%20%289706%29/
Apparently there are no O Level past papers for accounts. I don’t have much Information on this, i will try to find if there are any.