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Hi everyone. Is there any correlation between the AC test score and the RGC and classical test scores from younger years?
Also – any correlation between IReady scores and AC test scores?
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I believe the Academic Centers and RGCs use the same test.
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Iready and classical should be about the same. They test the same material and are a similar format. Any variability is likely just the variability in any test. My kids scored nearly identically.
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Thanks! Is anyone willing to share what their kids scored on prior RGC exams and what they scored on AC exams?
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5th grade RGC: 160
6th grade AC: 159-
Thank you. Very helpful to see the consistency. Did you take the RGC in earlier years? And any test prep that helped?
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No idea for RGC, but when my 2nd grader tested for kindergarten, her ready percentile were identical to her Classical scores.
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I was just thinking about this because my oldest child took the RCG/AC test for 7th grade entry after not taking it since Kindergarten entry.
I’ll use the RGC Composite scores because results from years ago only provided those numbers.
For K entry her RGC composite was 120. Seven years later for 7th grade entry her score was..122
(RGC Point total was 205/300 for an AC point total of 505/600 with straight A’s in 5th grade)I was surprised at the point consistency because in those seven years between tests she has been diagnosed with a learning disability. With interventions and tutoring, her iReady math/reading scores have increased from the 45-55th percentiles to the 80-90th.
But the RGC/AC test is very different than typical standardized tests. It is also age-adjusted so you don’t see point increases over time like with iReady.
I have another child who has taken the RGC exam more frequently and also has very consistent RGC Composite scores.
K entry 132
4th grade entry 134
5th grade entry 135
(That final score corresponds to a RGC point total of 237.5/300)My kids only took the Classical Test for K entry, but their percentiles were very similar to the iReady scores from around the same time. (45-55th for one, 95-99th for the other)
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Thank you. This all very helpful information. For the RGC scores, is there a percentile that we can find? I see that with classical scores but not with RGC scores.
Also – is there anything we can go with our kids early on to help them improve their RGC scores?
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CPS doesn’t provide percentiles, but the RGC/AC test is closest to an IQ test. Someone on a different thread posted this calculator for IQ score distribution, with 100 being the 50th percentile. The RGC composite score out of 160 is the one to use:
https://www.gigacalculator.com/calculators/iq-percentile-calculator.php
As far as prep materials, there are several postings on this site about what others have used including CogAT, OLSAT, Testingmom.com and Chicago Test Prep.
We had the kids do some informal prep with CogAT materials, and their scores moved up a little, but not much. Maybe more intensive prep would have moved them more, but not sure it would be worth the time trade off.
According to the website calculator above, my younger child’s composite score of 135 is 99th percentile. However, we’re Tier 4, and Tier 4 cut scores for Lane Tech and Whitney Young ACs have been at/above the 99.9th percentile (AC point totals in the 560-570 range. Subtracting 300 points for straight A’s leaves RGC point total 260-270 which converts to RGC composite scores of 144-148)
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Thanks for the info. All very helpful.
What I don’t understand is that a composite score of 131 puts the kids at 98th percentile, which is amazing. However, that score likely is not good enough for WY or Lane tech. However can that be? Does CPS have that many exceptionally gifted students?
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There are very few AC spots at Lane and WY. Lane has about 100 and WY around 150. 30% of offers go to the top scores with the remaining 70% split between the 4 tiers.
So at LTAC, for example, depending on how many from a tier are in that top 30%, there are only between 17-47 kids from the whole city who get offers per tier.
In comparison, Lane is ”easier” to get into for high school. The cut scores for tier 4 were equivalent to getting 91st percentiles for both math and reading plus straight A’s in 7th grade.
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Child 1 took RGC test in 3rd/4th grades with scores of 142 and 137 respectively. For 6th grade AC test we did a test prep course. Also had 50% extended time. So score went up a lot (160.) (We did not apply to WY/LT but those factors could explain others)
Child 2 took RGC test in K/1st/2nd with scores of 120/106/98 respectively. FWIW I don’t think child 2 is getting dumber but is a bit of a “free spirit” and not really familiar with paper/pencil tests (I tried to show them some examples before the test but they weren’t interested). Classical scores have jumped around even more
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