Cambridge International Examinations and Pearson Edexcel provide useful online resources for candidates, including past papers.
Cambridge International Examinations
You can search for support materials, including past exam papers, for IGCSEs and A/AS Levels by going to the CIE online resource centre.
Syllabus and Learner guide
Cambridge IGCSE English as a Second Language (Speaking endorsement) (0510)
Cambridge IGCSE English as a Second Language (Count-in speaking) (0511)
Pearson Edexcel
You can search for past exam papers for International GCSEs and A/AS Levels using the Pearson Edexcel past papers search tool.