A1 - Expansion $-$ 1 variable, degree 1 $-$ Very easy

Examples :   $2\left(4x+1\right);4\left(x-3\right)-3\left(4x+3\right)$

A2 - Expansion $-$ 1 variable, degree 1 $-$ Easy

Example :   $3\left(6x+4\right)+4\left(-3+3x\right)-3\left(4x+2\right)$

A3 - Expansion $-$ 2 ou 3 variables, degree 1 $-$ Easy

Example :   $2\left(4x-4y+2\right)-4\left(3x+2y+4\right)$

A4 - Expansion $-$ Degree 2 $-$ Medium

Examples :   $x\left(2x+4\right)-2x\left(3+3x\right);{\left(3x+2\right)}^2$

A5 - Expansion $-$ Degree 2 $-$ A bit difficult

Examples :   ${\left(-2x+2y+2\right)}^2;{\left(x-3\right)}^2\left(1-4x\right)$