It's been a long time since you've had to tackle some of the types of math questions found on the ACT.  If you need an in-depth review of the math topics on the ACT, Hammy's ACT Preparation YouTube channel is just what you need!! 

Unit 1- Pre-Algebra 1 (decimals, factors, square root, exponents, fractions, order of operations)

Unit 2- Pre-Algebra 2 (ratio, percent, statistics, probability, linear equations)

Unit 3- Elementary Algebra (expressions, exponents, radicals, polynomials, quadratic equations)

Unit 4- Intermediate Algebra (inequalities, absolute value, linear equations, rational and radical expressions, solving quadratic equations and inequalities, complex numbers, patterns, matrices)

Unit 5- Coordinate Geometry (number lines, graphing equations, midpoint and distance formulas, graphing conic sections

Unit 6- Plane Geometry (angles, quadrilaterals, triangles, circles, geometric formulas)

Unit 7- Trigonometry