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The problem you're describing has already been identified as a bug and is being investigated by our engineering team. I don't have an ETA for when they'll have the issue fixed, but someone will follow up with you as soon as we have an update.
I'm very sorry you've run into this problem, and thanks for your patience while our team works to get this resolved.
Thank you!
Susan KWeebly Customer Success Advocate
Key dates during Study Leave
iGCSE
Wednesday the 16th of May: P67 (Rm 218/219) Second half of a paper in timed conditions, P89 (Lecture theatre) Go through.
Monday 21st May: 14:50  17:00 (Rm 218/219) Revision session focusing on problem solving questions (plus trouble shooting)
Add Maths
Thursday 7th June: P69 Additional Maths Mock
Monday 11th June: (am) pick up marked paper
Friday 15th June: P5 Revision session
Wednesday the 16th of May: P67 (Rm 218/219) Second half of a paper in timed conditions, P89 (Lecture theatre) Go through.
Monday 21st May: 14:50  17:00 (Rm 218/219) Revision session focusing on problem solving questions (plus trouble shooting)
Add Maths
Thursday 7th June: P69 Additional Maths Mock
Monday 11th June: (am) pick up marked paper
Friday 15th June: P5 Revision session
IGCSE and Ad Maths Topic lists
Number
1. Integers, fractions, decimals (including converting recurring decimals to fractions)
2. Powers and roots, surds, laws of indices
3. Prime factors, LCM, HCF
4. Sets (including Venn diagrams)
5. Percentages (including % increase and decrease, finding original amount, compound interest)
6. Upper and lower bounds
7. Standard form
8. Ratio
Algebra
9. Solving linear equations
10. Expanding brackets and factorising
11. Simplifying algebraic expressions and fractions
12. Changing the subject of formulae
13. Direct and inverse proportion
14. Simultaneous equations (two linear or one quadratic and one linear)
15. Quadratic equations (completing the square, factorising, formula)
16. Quadratic inequalities
17. Linear inequalities
18. Inequalities defined by regions
19. nth term for linear sequences
20. Arithmetic sequences and series
21. Functions (notation, domain and range, composite functions, inverse functions, transformations)
22. Graphs (plot and draw accurately, find gradient by drawing a tangent, use the intersection of two graphs to solve an equation, apply transformations to graphs, trig graphs, midpoint of a line segment)
23. Equation of straight line (through two points, parallel and perpendicular lines)
24. Differentiation (gradients, maxima and minima, kinematics)
Geometry
25. Angles, triangles, quadrilaterals, parallel lines
26. Polygons (including interior and exterior angles)
27. Symmetry
28. Constructions (triangle, perpendicular bisectors, angle bisectors)
29. Circle theorems
30. Trigonometry (rightangled triangles, sine rule, cosine rule, area of triangle)
31. Pythagoras
32. Bearings
33. 3D trigonometry
34. Compound measures (density, speed, pressure)
35. Area of shapes (including sectors and segments of a circle)
36. Volume of solids
37. Similarity, including area and volume factors
38. Vectors (magnitude, adding and subtracting vectors)
39. Using vectors for geometrical proof
40. Transformations (translations, rotations, reflections and enlargement)
Statistics
41. Histograms
42. Cumulative frequency
43. Mean, median and mode, range and interquartile range
44. Probability, (including using tree diagrams or Venn diagrams)
Add Maths Topic List
45. Polynomials, including the remainder and factor theorems
46. Inequalities
47. The binomial expansion
48. Probability
49. Straight lines
50. Circles
51. Linear programming
52. Trigonometry
53. Differentiation
54. Integration
55. Calculus
1. Integers, fractions, decimals (including converting recurring decimals to fractions)
2. Powers and roots, surds, laws of indices
3. Prime factors, LCM, HCF
4. Sets (including Venn diagrams)
5. Percentages (including % increase and decrease, finding original amount, compound interest)
6. Upper and lower bounds
7. Standard form
8. Ratio
Algebra
9. Solving linear equations
10. Expanding brackets and factorising
11. Simplifying algebraic expressions and fractions
12. Changing the subject of formulae
13. Direct and inverse proportion
14. Simultaneous equations (two linear or one quadratic and one linear)
15. Quadratic equations (completing the square, factorising, formula)
16. Quadratic inequalities
17. Linear inequalities
18. Inequalities defined by regions
19. nth term for linear sequences
20. Arithmetic sequences and series
21. Functions (notation, domain and range, composite functions, inverse functions, transformations)
22. Graphs (plot and draw accurately, find gradient by drawing a tangent, use the intersection of two graphs to solve an equation, apply transformations to graphs, trig graphs, midpoint of a line segment)
23. Equation of straight line (through two points, parallel and perpendicular lines)
24. Differentiation (gradients, maxima and minima, kinematics)
Geometry
25. Angles, triangles, quadrilaterals, parallel lines
26. Polygons (including interior and exterior angles)
27. Symmetry
28. Constructions (triangle, perpendicular bisectors, angle bisectors)
29. Circle theorems
30. Trigonometry (rightangled triangles, sine rule, cosine rule, area of triangle)
31. Pythagoras
32. Bearings
33. 3D trigonometry
34. Compound measures (density, speed, pressure)
35. Area of shapes (including sectors and segments of a circle)
36. Volume of solids
37. Similarity, including area and volume factors
38. Vectors (magnitude, adding and subtracting vectors)
39. Using vectors for geometrical proof
40. Transformations (translations, rotations, reflections and enlargement)
Statistics
41. Histograms
42. Cumulative frequency
43. Mean, median and mode, range and interquartile range
44. Probability, (including using tree diagrams or Venn diagrams)
Add Maths Topic List
45. Polynomials, including the remainder and factor theorems
46. Inequalities
47. The binomial expansion
48. Probability
49. Straight lines
50. Circles
51. Linear programming
52. Trigonometry
53. Differentiation
54. Integration
55. Calculus
Practice Questions per Topic
"Drill questions" to get your skills up 
Harder Questions of Grade 9 Level 
When these are done, scan them or bring them to your teacher to mark. Answers will not be made available.

These are available in the "Protected Revision Materials" page.
You can find IGCSE Revision Materials and Add Maths Revision Materials in the PASSWORD PROTECTED PAGE, by clicking the image below. 
Other IGCSE Revision Materials
Answers to the 6 Edexcel practice papers
A great set of worksheets to revise from! Ask your teachers for solutions if needed.
A workbook (which you can purchase alongside a guide with answers) to get you started.
Questions for IGCSE sorted by topic can be found here.
Revision guides by IGCSE topic can be found and printed here.
A great set of worksheets to revise from! Ask your teachers for solutions if needed.
A workbook (which you can purchase alongside a guide with answers) to get you started.
Questions for IGCSE sorted by topic can be found here.
Revision guides by IGCSE topic can be found and printed here.
Year 10 Summer Exam Revision List (IGCSE and Add Maths)
Under construction.
Year 10 Summer Exam Revision List (IGCSE only)
Probability Tree diagrams, independent and mutually exclusive events
Drawing reciprocal functions and identifying graphs 1/x, 1/x2, straight lines, quadratics, cubics
Quadratics Solving quadratics by factorising, using the quadratic formula, and by completing the square. Using the discriminant. Identify the vertex from a quadratic in completed square form. Solve simultaneous equations where the equations could be linear or quadratic.
Enlargement Length, Area, and Volume factors
Inequalities Solving linear and quadratic inequalities, and be able to show linear inequalities on a graph (e.g. y < 2x+1) by shading
Pyramids, Cones, and Spheres Volume and surface area
Simplify algebraic fractions and solve equations with algebraic fractions
Circle Theorems
Calculating arc length, areas of sectors and segments of a circle
Arithmetic Sequences finding the nth term, finding the sum of the first n terms
Rearranging formulae to change the subject
Sets and Venn diagrams union, intersection, element, number of elements, universal set, subset and complement
Indices including integer, fractional and negative powers.
Solving problems in three dimensions using Pythagoras’ Theorem and/or trigonometry
Using graphs to solve equations including deciding which linear graph to draw to solve an equation with a predrawn graph
Bounds solve problems involving upper and lower bounds
Note: Histograms will not appear in the test and will be covered in year 11.
Drawing reciprocal functions and identifying graphs 1/x, 1/x2, straight lines, quadratics, cubics
Quadratics Solving quadratics by factorising, using the quadratic formula, and by completing the square. Using the discriminant. Identify the vertex from a quadratic in completed square form. Solve simultaneous equations where the equations could be linear or quadratic.
Enlargement Length, Area, and Volume factors
Inequalities Solving linear and quadratic inequalities, and be able to show linear inequalities on a graph (e.g. y < 2x+1) by shading
Pyramids, Cones, and Spheres Volume and surface area
Simplify algebraic fractions and solve equations with algebraic fractions
Circle Theorems
 The angle subtended by an arc at the centre of a circle is twice the angle subtended at any point on the remaining part of the circumference.
 The angle subtended at the circumference by a diameter is a right angle
 The angles in the same segment are equal
 The sum of the opposite angles of a cyclic quadrilateral is 180°
 The tangent is perpendicular to the radius of a circle
 The length of tangents to external point are of equal length
Calculating arc length, areas of sectors and segments of a circle
Arithmetic Sequences finding the nth term, finding the sum of the first n terms
Rearranging formulae to change the subject
Sets and Venn diagrams union, intersection, element, number of elements, universal set, subset and complement
Indices including integer, fractional and negative powers.
Solving problems in three dimensions using Pythagoras’ Theorem and/or trigonometry
Using graphs to solve equations including deciding which linear graph to draw to solve an equation with a predrawn graph
Bounds solve problems involving upper and lower bounds
Note: Histograms will not appear in the test and will be covered in year 11.
Year 10 formula sheet (provided in the exams)