Rounding the Composite

The composite comes from three section scores. Add them up, divide by 3, and you get the unrounded composite - almost always a decimal. The reported score is just that decimal rounded to the nearest whole number, using ordinary rounding rules: anything ending in point five or higher rounds up, anything below point five rounds down.

This is why a single extra right answer can matter so much. Each section score only moves in whole-point steps, but dividing by three turns a one-point change into a one-third-point change in the average. Stack that against a decimal sitting right at point five, and one more correct answer in just one section is enough to push the average over the line and raise the whole composite by a full point. The same logic works in reverse: missing one question in one section can drop an average from point five to point four, which rounds down instead of up.

This sits right next to how the three sections themselves are built - English, math, and reading each produce their own scale score first, and only then get averaged together. Understanding the rounding step explains why small differences in raw performance on any one section can ripple into a visibly different composite, even when the other two sections stay identical. It also explains why aiming to raise just one weak section is often the most efficient way to move the final number.