We graded 9 companies on seven things customers actually report: satisfaction, reliability, workmanship, value, momentum, track record and how owners handle complaints.
—typical jobiMedian of the bill customers reported in their Google review (Google asks reviewers for a price range; we use the middle of each range).
96%say the price was fairiOf customers who rated the price, the share who chose “Great price” or “Reasonable” rather than “Overpriced”.
4.93★average ratingiPlain average of every Google star rating we collected for these companies.
1.3%bad jobs (1–2★, 2 yrs)iShare of 1–2★ reviews in the last 24 months — or the 20 newest reviews when the company had fewer than 20 in that time.
From 14,146 Google reviews of 24 top-rated test prep nationwide; 9 of them in Mesa, AZ. Updated November 1, 2026.
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Experts Score 0–100iExperts Score (0–100)Absolute quality first: recency-weighted star average (≈54%), share of 1–2★ reviews (≈24%), customers’ price verdicts (≈14%), owner replies to critical reviews (≈7%); minus up to 10 points each for complaints flagged in Google review highlights and for a real slide in recent ratings. Hover a company’s score on its page for the full breakdown. and a letter grade per factor (A = top 20% of test prep).
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Company
ScoreiExperts Score (0–100)Absolute quality first: recency-weighted star average (≈54%), share of 1–2★ reviews (≈24%), customers’ price verdicts (≈14%), owner replies to critical reviews (≈7%); minus up to 10 points each for complaints flagged in Google review highlights and for a real slide in recent ratings. Hover a company’s score on its page for the full breakdown.
FactorsiFactor grades, in orderSatisfaction (54%): Recency-weighted star average (2-year half-life), shrunk toward the category mean by review volume; the company’s own lifetime average as the prior; absolute: 4.0★ = 0, 5★ = 100.Reliability (24%): How rarely jobs go badly: share of 1–2★ reviews — 60% the last 24 months (or the 20 newest if fewer), 40% all-time; 0% = 100, 15%+ = 0; the category percentile can only raise it.Craft & service (0%): Google review highlights: Quality, Professionalism, Responsiveness, Punctuality — how rarely reviewers flag them as a negative, per review since highlights began; 0% = 100, 5%+ = 0. Subtracted from the score (up to −10), never averaged in — clean highlights are the norm, not a bonus.Value (14%): Customers’ own price verdicts (Great / Reasonable vs Overpriced) and Value highlights; 65% absolute (all “reasonable” ≈ 80, “great” = 100), the category percentile can only raise it.Momentum (0%): Penalises only a real slide: last-12-month average below lifetime (−0.5★ = 0). Still 4.8★+ over the last year, or steady/improving = 100. Subtracted from the score (up to −10), never averaged in.Replies to reviews (7%): How often the owner publicly replies to reviews under 5★ (1–4★). Needs 3+ such reviews, otherwise not counted; 65% absolute (80%+ replied = 100), the category percentile can only raise it.One letter per factor score: A = 80+, B = 60–79, C = 40–59, D = 20–39, F = below 20.
★iGoogle star rating as shown on Google Maps.
Typical billiMedian bill customers of this company reported in their reviews (needs 3+ priced reviews).
A100iHow the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 69%100+69.2Reliability 31%99+30.5Experts Score= 100Not enough data for value, replies to reviews; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.
A99iHow the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 59%100+58.7Reliability 26%99+25.8Value 15%98+14.9Experts Score= 99Not enough data for replies to reviews; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.
A95iHow the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 64%95+60.4Reliability 28%95+26.8Replies to reviews 8%100+8.2Experts Score= 95Not enough data for value; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.
A95iHow the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 64%95+60.4Reliability 28%94+26.5Replies to reviews 8%100+8.2Experts Score= 95Not enough data for value; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.
A93iHow the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 64%92+58.4Reliability 28%93+26.3Replies to reviews 8%100+8.2Experts Score= 93Not enough data for value; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.
A91iHow the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 55%97+52.9Reliability 24%99+24Value 14%89+12.6Replies to reviews 7%27+1.9Experts Score= 91Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.
A89iHow the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 64%89+56.5Reliability 28%92+26Replies to reviews 8%80+6.6Experts Score= 89Not enough data for value; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.
B79iHow the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 64%87+55.3Reliability 28%83+23.4Replies to reviews 8%3+0.2Experts Score= 79Not enough data for value; its weight is shared by the others.Grade B: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.
B75iHow the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 64%82+52.1Reliability 28%77+21.7Replies to reviews 8%21+1.7Experts Score= 75Not enough data for value; its weight is shared by the others.Grade B: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.
AB––AD
4.80
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What jobs cost
What customers paid, from the price Google asks reviewers to report.
Job
Lowi25th percentile: 1 in 4 customers paid less than this.
TypicaliMedian of the bill customers reported in their Google review (Google asks reviewers for a price range; we use the middle of each range).
Highi75th percentile: 1 in 4 customers paid more than this.
FairiOf customers who rated the price, the share who chose “Great price” or “Reasonable” rather than “Overpriced”.
Test Prep in Mesa, AZ at a glance
How the 9 test prep we rated in Mesa, AZ compare, and what customers praise most.
Experts Score grades
A = score 80+, F = below 20.
9companies
Grade A778%
Grade B222%
Grade C00%
Grade D00%
Grade F00%
Google ratings
Average stars per company.
4.92avg ★
4.90★ and up778%
4.80–4.89★222%
4.60–4.79★00%
Below 4.60★00%
What customers praise
Share of Google review highlights.
2,642highlights
Quality98537%
Professionalism94436%
Responsiveness00%
Punctuality00%
Value71327%
Was the price fair?
All price verdicts left with reviews.
96%fair
Great price2430%
Reasonable4962%
Overpriced34%
Not sure34%
Price verdicts by year
Share calling it great / reasonable / overpriced.
2025
2026
How we grade
Satisfaction (54%) — Recency-weighted star average (2-year half-life), shrunk toward the category mean by review volume; the company’s own lifetime average as the prior; absolute: 4.0★ = 0, 5★ = 100.
Reliability (24%) — How rarely jobs go badly: share of 1–2★ reviews — 60% the last 24 months (or the 20 newest if fewer), 40% all-time; 0% = 100, 15%+ = 0; the category percentile can only raise it.
Craft & service (penalty, up to −10) — Google review highlights: Quality, Professionalism, Responsiveness, Punctuality — how rarely reviewers flag them as a negative, per review since highlights began; 0% = 100, 5%+ = 0. Subtracted from the score (up to −10), never averaged in — clean highlights are the norm, not a bonus.
Value (14%) — Customers’ own price verdicts (Great / Reasonable vs Overpriced) and Value highlights; 65% absolute (all “reasonable” ≈ 80, “great” = 100), the category percentile can only raise it.
Momentum (penalty, up to −10) — Penalises only a real slide: last-12-month average below lifetime (−0.5★ = 0). Still 4.8★+ over the last year, or steady/improving = 100. Subtracted from the score (up to −10), never averaged in.
Replies to reviews (7%) — How often the owner publicly replies to reviews under 5★ (1–4★). Needs 3+ such reviews, otherwise not counted; 65% absolute (80%+ replied = 100), the category percentile can only raise it.
The 10 best-rated test prep in Mesa, AZ average 4.9★ on Google across 6,225 reviews. Mathnasium has the top rating (5.0★), and East Valley Endoscopy has the most reviews (2,074). Updated October 29, 2026.
10 companies that meet our bar: rated 4.5★ or higher on Google, with a meaningful review history (6,225 reviews combined) and currently operating. Request a call back and the company will phone you directly.
Surgical center · 6020 E Arbor Ave #105, Mesa, AZ 85206
“Dr. Stein was amazing with me. He explained everything to me and asked if I had questions. The whole staff was so pleasant and amazing. I highly recommend them. I drove over 1 hour to see them. I was able to get in fast.” — Google review
“Dr Devakumar is absolutely wonderful. She explains everything in a manner that is understood and doesn’t rush her services or time. I highly recommend her.” — Google review
Trade school · 1010 E Jefferson St, Phoenix, AZ 85034
“Arizona Contractors License Center was awesome. They made it incredibly easy to go through the process and in obtaining my license. Milka and Isaac were incredibly at helping me through every step of the way. Thank…” — Google review
Hearing aid store · 7115 E Baseline Rd #107, Mesa, AZ 85209
“Joann is amazing! Truly interested in doing the best she can to provide the very best hearing possible for her patients. She’s very patient and thoroughly explains what to expect from your hearing aids and how to…” — Google review
Tutoring service · 9221 E Baseline Rd #103, Mesa, AZ 85209
“We have had a great experience at Mathnasium! My son loves working with JC, he makes the sessions fun and is able to connect with the kids. All the tutors are great though and my son's math skills and confidence are…” — Google review
Audiologist · 4824 E Baseline Rd Ste 102, Mesa, AZ 85206
“Sound Relief has been great for my tinnitus. They are always willing to help and clean/replace part of my hearing aids. Just moved from Colorado and the Mesa team picked up right where they left off.” — Google review
Hearing aid store · 5110 E Southern Ave #111, Mesa, AZ 85206
“I am so glad that I decided to go into your office to check and see if I needed hearing aids (which I knew that I probably did). Phillip helped me pick out the ones that would be best for me, fitted them perfectly…” — Google review
“Trey has been so incredibly helpful. He patiently coached my son through the toughest algebra problems and gave him the confidence that he could do it on his own. After struggling to grasp concepts, even his teacher…” — Google review
“My visit went very well from check-in to check-out.
Everyone was very helpful and courteous. Especially Dr. Kathleen Vize. She took the time to explain how my cataracts were affecting my vision and how I would…” — Google review
Tutoring service · 3244 E Guadalupe Rd, Gilbert, AZ 85234
“Mathnasium is an amazing place for progeny to learn. The teachers are kind, loving and supportive. Thank you for existing and helping my littles with their math learning experience.” — Google review
We scan Google Maps for test prep listings in and around Mesa, keep only open businesses whose main category matches the service, and require a Google rating of at least 4.5 from at least 20 reviews. Companies are ordered by a confidence-weighted score that balances rating and review volume. We do not accept payment for placement.
Frequently asked questions
Who is the highest-rated test prep in Mesa?
Mathnasium has the highest Google rating on our Mesa list: 5.0 out of 5 from 112 reviews (as of October 29, 2026).
Which test prep in Mesa has the most reviews?
East Valley Endoscopy has the most Google reviews among the companies listed here: 2,074, with a 4.9★ average.
How are these test prep chosen?
Only open Mesa-area businesses whose Google category matches the service, rated at least 4.5★ from at least 20 Google reviews. They are ordered by a confidence-weighted score of rating and review volume. Placement is never paid.