Maths focus 2A ($15) = X ch.1 (similar triangles), ch.3 (identities), ch.4 (factorization of polynomials) and ch.5 (algebraic fractions and formulas)
Maths focus 2B ($15) = X ch.8 (linear inequalities in one unknown), ch.9 (linear equations in two unknowns) and ch.13 (Areas and volumes II)