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Casio FX-991 CW
The Casio ClassWizz is a brilliant scientific calculator, which is very capable of speeding up GCSE maths when used correctly.
It is well worth spending time familiarising yourself with the common inbuilt tools:
Solving Simultaneous Equations
Solving Quadratics
Solving Quadratic Inequalities
Solve Any Equation!
Addvance Maths 