Demystifying Standardized Test Scores: A Parent's Guide to Growth vs. Proficiency

Demystifying Standardized Test Scores

Those district envelopes with your child's test scores — percentiles, lexile levels, proficiency bands — read like a different language if nobody explains them. Here is a plain-language breakdown of what the numbers actually mean.

Proficiency: Where Your Child Is Right Now

Proficiency tells you whether your child met the state's grade-level standard. In Nevada, that standard is set by the Smarter Balanced Assessment. A student who scores "Proficient" or "Above Proficiency" is performing at or above grade level.

That sounds simple, but there is a problem with stopping here. Proficiency is a snapshot. It tells you where a student is today — not whether they are moving forward, standing still, or falling further behind.

The Proficiency Trap

A student who starts three grade levels behind and finishes only one grade level behind made real progress. But they are still labeled "Not Proficient" on the official report. That label buries the actual story. Meanwhile, a student from an affluent household who entered school already at grade level and stayed there will be labeled "Proficient" even if the school added almost nothing to their trajectory.

This is why Nevada's NSPF star rating does not rely on proficiency alone.

Growth: The More Important Number

Nevada calculates an Academic Growth Percentile (AGP) for grades 4-8. It measures how much each student's scores improved from one year to the next compared to Nevada students who scored at the same level the year before.

An AGP of 60 means your child grew faster than 60% of students who started in the same place. An AGP of 30 means they grew more slowly than most of their academic peers. This is the number that tells you what the school is doing, not just where your child happened to start.

How to Read the Full Report

When you get a score report, look for four things:

1. The proficiency level: Is your child at grade level? If not, how far below? 2. The growth score: Did your child's scores improve from last year? By how much relative to similar students? 3. Subject-by-subject breakdown: A student can be proficient in ELA and struggling in math. 4. The trend over multiple years: One year of data is unreliable. Two or three years shows the actual pattern.

What to Ask at Parent-Teacher Conferences

When you sit down with the teacher, bring the score report and ask:

• Is this growth typical for my child, or different from what you see in class?
• How does my child's growth compare to classmates who started in the same place?
• What specific skills are behind the score, and what can we do at home?

The goal is to turn a printed number into a conversation about your specific child — not a state average.

A Note on Lexile Scores

Lexile levels appear on many Nevada reading reports. A Lexile score (e.g., 820L) represents reading difficulty. A third grader reading at 820L is reading above grade level; a fifth grader at 820L is below it. Lexile scores are useful for choosing books at the right level — they measure something different than the Smarter Balanced proficiency band, but both are worth knowing.

See how your child's school performs on academic growth and proficiency at NevadaSchools.org.