Magnetic fields

To understand electric magnetic fields you need to have all the basic terms as their definitions (flux, flux linkage, flux density etc.) sorted. Produce a nice summary page which you can refer to. Comparing electric and magnetic circuits is a nice place to start.
Here are some resources to help:
http://www.physbot.co.uk/magnetic-fields-and-induction.html
http://www.cyberphysics.co.uk/topics/magnetsm/Magnetic%20Fields%20A2/A2%20Magnetic%20Fields.htm
http://chubbyrevision-a2level.weebly.com/electric-and-magnetic-fields.html

Some good revision notes:
http://www.mathsmadeeasy.myzen.co.uk/a2-physics-ocr/G495%20-%20Field%20and%20Particle%20Pictures%20-%20Revision.pdf

Some videos (I couldn’t view them so do not vouch for their usefulness):
http://www.youtube.com/watch?v=MJGRVso9xTo
http://www.youtube.com/watch?v=Cq-oq1rPw_c
http://www.youtube.com/watch?v=Dc8Vay7mRss

Fission and fusion questions

Here is a nice summary of the main ideas: http://physics.stackexchange.com/questions/32699/how-to-explain-e-mc2-mass-defect-in-fission-fusion
http://youtu.be/4N3Srx0xRQc

And some questions:
http://www.chem.tamu.edu/class/fyp/mcquest/ch26.html
http://www.antonine-education.co.uk/Pages/Physics_5/Nuclear_Physics/NUC_07/Nuclear_7.htm
http://www.usna.edu/Users/chemistry/morse/_files/documents/SC112-Chapter23/ws23.4.doc

Fission and fusion

Fusion is the combining of small nuclei; fission is the breaking apart of large ones. This leads to a tiny amount of mass going missing (the mass defect) which is converted into energy and represents the binding energy of the atom.

http://www.diffen.com/difference/Nuclear_Fission_vs_Nuclear_Fusion

http://physics.stackexchange.com/questions/32699/how-to-explain-e-mc2-mass-defect-in-fission-fusion

http://hyperphysics.phy-astr.gsu.edu/hbase/nucene/nucbin.html

The valley of stability

Some atoms decay; some do not. The balance between electrostatic and strong nuclear force is the key to stability.

We represent this in an N-Z plot. This tells you the type of decay we can expect is an atom has veered off the path.

Here are some resources:
http://www.a-levelphysicstutor.com/nucphys-NZ-curve.php
http://youtu.be/UTOp_2ZVZmM – good summary video
http://www.triumf.ca/sites/default/files/Yen_Nuclear_Binding.pdf

Section C question

Here are some more questions and answers to help you prepare: http://cupofteaching.com/2014/05/10/advance-notice-article-g495-mock-exam-june-2014/