U can find both edexcel and cambridge from xtremepapers.com . Either u can find theme from their own websites like for:
Cambridge: www.cie.org.uk
Edexcel : www.edexcel.com
they are previous exams for the certain year
Freeexampapers.com
xtremepapers.com
www.cie.org.uk
Search on Google for free IGCSE past papers maths. You will get a number of sites: pick any. You will need to specify your board (Edexcel, CIE), and possibly the specification code.
xtremepapers.com
try drtayeb.com
edexcel.com n xtremepapers.com
Use the cie link below for past papers; use the sanskrit link below for current papers.
Try http://www.freeexampapers.com
go to xtremepapers.com and from there go to the CIE section and so on...
Use these sites only to get ideas since they have plagiarism policies and they check regularly for cheats. You will get caught.
Google it and you will get a studentforums.biz link where you can find some of the papers ;)
you need to just keep solving the past year papers and be aware of the formulas and your concepts should be clear, don't worry and be calm you will do well
we have to learn all the practical questions and stuff related to the practical for more help solve one or two past papers from xtremepapers.com