Below is a list (which I am currently in the process of adding to) of where I got most of my information for my notes from externally (i.e. not from lessons in school) - I may have used other sources and forgotten about them, in which case I apologise for leaving it out, as it has been some time since I made these notes.
I have not included all of the websites which I took the diagrams and pictures from, though for the sciences most of them came from CGP revision guides...
IGCSE Biology Notes
A, H. (2013) ‘IGCSE biology’, Available at: http://hannahhelpbiology.blogspot.co.uk
Larkcom, E., Delpech, R. and Evans, K. (2013) Edexcel international GCSE and certificate biology student’s book: Student’s book and CD. London: Hodder Education.
Bradfield, P. and Potter, S. (2009) Edexcel international GCSE biology student book with ActiveBook CD. Harlow: Pearson Education.
Gannon, P. and Bowness, E. (2012) Edexcel certificate/international GCSE biology revision guide (with online edition). Edited by CGP Books. United Kingdom: Coordination Group Publications Ltd (CGP).
IGCSE Chemistry Notes
A, H. (2013) ‘IGCSE chemistry’, Available at: http://hannahhelpchemistry.blogspot.co.uk
Clark, J. (2009) Edexcel international GCSE chemistry student book with ActiveBook CD. Harlow: Pearson Education.
Gannon, P., Braid, K. and Thompson, M. (2012) Edexcel certificate/international GCSE chemistry revision guide (with online edition). Edited by CGP Books. United Kingdom: Coordination Group Publications Ltd (CGP).
IGCSE Physics Notes
A, H. (2013) ‘IGCSE physics’, Available at: http://hannahhelphysics.blogspot.co.uk
Arnold, B., Woolley, S. and Johnson, P. (2009) Edexcel international GCSE physics student book with ActiveBook CD. Harlow: Pearson.
Books, C. (ed.) (2013) Edexcel certificate/international GCSE physics revision guide (with online edition). London, United Kingdom: Coordination Group Publications Ltd (CGP).
IGCSE Maths Notes
BBC (2016) Links. Available at: http://www.bbc.co.uk/education/subjects/z6pfb9q
IGCSE English Literature Notes
Parsons, R. and Edited, R.P. (2007) GCSE English ‘to kill a mockingbird’: The text guide. Edited by CGP Books. United Kingdom: Coordination Group Publications Ltd (CGP).
Parsons, R. (2002) ‘GCSE Shakespeare: ’‘Romeo and Juliet’‘ - the complete play Pt. 1 & 2 (Gcse English annotated text)’. Edited by CGP Books. United Kingdom: Coordination Group Publications Ltd (CGP).
http://www.acceleratedstudynotes.com/
IGCSE Spanish Notes
Cascante, J.L. and Lopez-Cascante, J. (2013) Edexcel international GCSE and certificate Spanish teacher resource and audio-cDs. Edited by Judith O’Hare. London: Hodder Education.
GCSE Music Notes
Parsons, R. (2006) GCSE music complete revision & practice with audio CD. Edited by CGP Books. United Kingdom: Coordination Group Publications Ltd (CGP).
http://www.acceleratedstudynotes.com/
GCSE History Notes
Parsons, R. and Shepperson, A. (2003) GCSE history: Complete revision and practice Pt. 1 & 2 (complete revision & practice). Edited by CGP Books. United Kingdom: Coordination Group Publications Ltd (CGP).