anchor.diff:  "y12fm",1,"test-initial","Settling-in (same as Maths, higher threshold)","assess","assessments/a-level-settling-in-exam-actual.docx"
   "y12fm",1,"1core1","Complex numbers (intro, argand, loci)","learn","edexcel-schemes/fm/1core1.pdf"
   "y12fm",1,"1core2","Matrices","learn","edexcel-schemes/fm/1core2.pdf"
  -"y12fm",1,"test-ht1","HT1 test - ready for 0123 entry","assess","assessments/fm2017-ht1.docx"
  +"y12fm",1,"test-ht1","HT1 test - ready for 0123 entry","assess","assessments/fm-y12-ht1.docx"
   "y12fm",2,"1core3","Complex numbers (conjugate, division, polynomials)","learn","edexcel-schemes/fm/1core3.pdf"
   "y12fm",2,"1core4","Series","learn","edexcel-schemes/fm/1core4.pdf"
   "y12fm",2,"1core5","Algebra and functions","learn","edexcel-schemes/fm/1core5.pdf"
  -"y12fm",2,"test-ht2","HT2 test (wc27/11), ready for Y12 SCE!","assess","assessments/fm2017-ht2.docx"
  +"y12fm",2,"test-ht2","HT2 test (wc27/11), ready for Y12 SCE!","assess","assessments/fm-y12-ht2.docx"
   "y12fm",2,"1core6","Proof by induction","learn","edexcel-schemes/fm/1core6.pdf"
   "y12fm",2,"1core7","Vectors (lines and planes)","learn","edexcel-schemes/fm/1core7.pdf"
  -"y12fm",3,"test-jan-mock","Mock exam - trimmed AS paper","assess",
  +"y12fm",3,"test-jan-mock","Mock exam - trimmed AS paper","assess","assessments/fm-y12-ht3-mock.pdf"
   "y12fm",3,"1core8","Calculus (volumes of revolution)","learn","edexcel-schemes/fm/1core8.pdf"
   "y12fm",3,"1mech1","Momentum and impulse 1","learn","edexcel-schemes/fm/1mech1.pdf"
   "y12fm",3,"1mech2","Work, energy and power","learn","edexcel-schemes/fm/1mech2.pdf"
   "y12fm",3,"1dec1","Algorithms and graph theory 1","learn","edexcel-schemes/fm/1dec1.pdf"
  -"y12fm",3,"test-ht3","HT3 test","assess",
   "y12fm",4,"1mech3","Elastic collisions","learn","edexcel-schemes/fm/1mech3.pdf"
   "y12fm",4,"1dec2","Algorithms on graphs (MST, Dijkstra)","learn","edexcel-schemes/fm/1dec2.pdf"
   "y12fm",4,"1dec3","Algorithms on graphs (Route inspection)","learn","edexcel-schemes/fm/1dec3.pdf"
  
positive.code: "y12fm",6,"2core1","DeMoivre's Theorem, nth complex roots","learn","edexcel-schemes/fm/2core1.pdf"
  "y13fm",1,"2dec10","Critical path 2: resource histograms and scheduling","learn","edexcel-schemes/fm/2dec10.pdf"
  "y13fm",1,"2mech4","Momentum and impulse in 2D","learn","edexcel-schemes/fm/2mech4.pdf"
  "y13fm",1,"test-y13ht1","HT1 test, ready for 0123 in Oct","assess",
  "y13fm",2,"2core2","Hyperbolic functions","learn","edexcel-schemes/fm/2core2.pdf"
  "y13fm",2,"2core3","Polar co-ordinates","learn","edexcel-schemes/fm/2core3.pdf"
  "y13fm",2,"2mech6","Collisions in 2D","learn","edexcel-schemes/fm/2mech6.pdf"
  
negative.code: "y13m",1,"2pure2","Partial fractions and algebraic division","learn","edexcel-schemes/m/2pure2.pdf"
  "y13m",1,"2pure5","Binomial expansion, advanced","learn","edexcel-schemes/m/2pure5.pdf"
  "y13m",1,"2stats1","Correlation and regression, advanced","learn","edexcel-schemes/m/2stats1.pdf"
  "y13m",1,"test-y13ht1","HT1 test, ready for 0123 in Oct","assess","assessments/maths-y13-ht1.docx"
  "y13m",1,"2mech4","Moments","learn","edexcel-schemes/m/2mech4.pdf"
  "y13m",1,"2mech5","Resolving forces, friction","learn","edexcel-schemes/m/2mech5.pdf"
  "y13m",2,"2pure6","More trigonometry (radians, identities)","learn","edexcel-schemes/m/2pure6.pdf"
  "y13m",2,"2pure8","Differentiation, advanced","learn","edexcel-schemes/m/2pure8.pdf"
  "y13m",2,"2stats2","More probability","learn","edexcel-schemes/m/2stats2.pdf"
  "y13m",2,"test-y13ht2","HT2 test, late Nov","assess","assessments/maths-y13-ht2.docx"
  "y13m",2,"2mech6","Projectiles","learn","edexcel-schemes/m/2mech6.pdf"
  "y13m",3,"test-y13-mock","January Mock","assess",
  "y13m",3,"2stats3","Normal distribution","learn","edexcel-schemes/m/2stats3.pdf"
  