What is actually on the sheet
The reference sheet is a single panel you can open at any time during the Math section. Its content is geometry. It gives the area of a circle and its circumference, the area of a rectangle and a triangle, the Pythagorean theorem, the side ratios of the 30 60 90 and 45 45 90 special right triangles, the volumes of a rectangular solid, a cylinder, a sphere, a cone, and a pyramid, and the fact that a circle has 360 degrees and 2 pi radians and a triangle's angles sum to 180 degrees.
That is the whole list. It has not changed with the move to digital, and it is identical on every form.
In the figure shown, AB is a diameter of the circle with center O. What is the circumference of the circle?
What it does not give you
Everything algebraic. Slope, the slope intercept and point slope forms of a line, the quadratic formula, the vertex form of a parabola, the sum and product of roots, exponent and radical rules, and the difference of squares are all on you.
Everything statistical. Mean, median, percent change, and the relationship between percent and decimal are not on the sheet either. Neither are the arc length and sector area relationships, the equation of a circle in the coordinate plane, or SOHCAHTOA.
This matters because Algebra and Advanced Math together are about 70 percent of the Math section. The sheet helps on the roughly 15 percent that is Geometry and Trigonometry, and even then only for the formula lookup part.
The formulas worth memorizing first
Start with slope as the change in y over the change in x, slope intercept form, and the quadratic formula, because those three cover a large share of the questions the reference sheet cannot help with.
Then add the equation of a circle with center h comma k and radius r, the three exponent rules for multiplying, dividing, and raising powers, percent change as the difference divided by the original, and the three basic trig ratios. Those are the ones that show up repeatedly.
A shortcut worth knowing: the vertex of a parabola sits at x equals negative b over 2a. It is not on the sheet and it turns several Advanced Math questions into one line of arithmetic.
Why opening the sheet costs you time
Every time you open the reference panel you spend a few seconds finding the formula on it. Three or four lookups across a module is fine. Ten is a sign that you are using it as a crutch for formulas you should know.
A good test of readiness is to write the full geometry sheet from memory. If you can do that, you will only open the panel to confirm something, which is what it is designed for.
Desmos as a second reference
The built in Desmos calculator partly substitutes for formulas you have not memorized. You can graph a parabola to find its vertex, graph two equations to find an intersection, or type an equation and read off the roots instead of using the quadratic formula.
That works, and it is a legitimate strategy, but it is slower than knowing the formula on questions where the algebra is quick. Use Desmos when the algebra is messy and use the formula when it is not.