Below are all the IGCSE Papers by Edexcel. Most have answer schemes with them.
In addition, the 2 links below go to old GCSE papers, which are about 90% the same as IGCSE and Cambridge IGCSE papers, which are from a different board.
IGCSE Paper 3 (may 2004) - Higher (answers included)
IGCSE Paper 4 (may 2004) - Higher (answers included)