KDP categories · Top KDP authors
Testing & Certification: Amazon KDP category data
Amazon Books Best Sellers data for Testing & Certification, updated Nov 2, 2026: median price $21.79, median 25 reviews, average rating 4.5 and a KDPTop opportunity score of 33/100 (highly competitive).
| Price range (middle 50%) | $18.99 – $32.99 |
|---|---|
| Average rating | 4.5 |
| New releases (90 days) | 12% |
| Books on the list | 100 |
| Store | Books |
What stands out
- Its median reviews are 11% of the parent category Repair & Maintenance (236), one of the easier corners under it.
Top 10 Testing & Certification best sellers
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CDL Study Guide 2025-2026: Your All-in-One Course, 2000+ Practice Questions + Online Platform + Full-Length Exams for All Classes + Proven Strategies
by Learnik Press
- List rank#1
- Price$14.63
- Rating4.6
- Reviews185
-
CDL Study Guide: Complete Review + Real DMV-Style Questions and Detailed Answer Explanations (Exam Simulator and E-Learning Access)
by Newstone TP
- List rank#2
- Price$19.99
- Rating4.8
- Reviews192
-
Automotive Multimeter Techniques: Electrical Diagnosis Step by Step - Voltage Drop, Sensor Testing, and the 20 Measurements That Solve 90% of Faults (Automotive Diagnostics & Scan Tool Series)
- List rank#3
- Price$9.99
- Rating5.0
- Reviews2
-
RV 12 Volt Electrical Troubleshooting Made Simple: Find Battery Drain, Blown Fuses, Converter Failures and Faulty Wiring with Easy Multimeter Tests, Visual Diagrams and DIY Repair Checklists
by Mason Whitaker
- List rank#4
- Price$10.08
- Reviews-
-
Vehicle Maintenance Log Book
by GE Condit
- List rank#5
- Price$7.99
- Rating4.7
- Reviews88
-
ASE A1-A9 Study Guide: The Ultimate All-in-One Test Prep to Ace the ASE Exams, Become a Master Technician, and Take Your Career to the Next Level
by Textora Publishing
- List rank#6
- Price$29.99
- Rating4.4
- Reviews80
-
Florida Driver’s License Exam Prep: Everything You Need to Pass → Practice Questions Based on the Latest DMV Manual, Road Signs, Traffic Laws, Driving ... & Detailed Explanations of What to Expect!
- List rank#7
- Price$18.99
- Rating4.4
- Reviews131
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Georgia Driver’s License Exam Prep: 100 Practice Questions Based on the Latest DDS Manual, Detailed Answer Explanations, Road Signs, Traffic Laws, Top Tips for Passing the Road Skills Test, & More!
- List rank#8
- Price$18.99
- Rating4.8
- Reviews33
-
New York Driver’s License Exam Prep: Everything You Need to Pass → Practice Test Based on the Latest DMV Manual, Road Signs, Traffic Laws, & Detailed Explanations of What to Expect!
- List rank#9
- Price$18.99
- Rating4.6
- Reviews32
-
ASE Engine Repair Certification Test (A1)
by AudioLearn Content Team
- List rank#10
- Price$15.13
- Rating4.0
- Reviews16
FAQ
Is Testing & Certification a good niche for Amazon KDP?
Its KDPTop opportunity score is 33/100, which makes it highly competitive. The median best seller has 25 reviews and sells for $21.79.
How many reviews do you need to rank in Testing & Certification?
The median best seller has 25 reviews, and 78% of them have fewer than 100.
What do Testing & Certification best sellers cost?
The median price is $21.79; half of the best sellers are priced between $18.99 and $32.99.
Can new books break into Testing & Certification?
12% of the current best sellers were released in the last 90 days.
About this data
Data comes from KDPTop's daily crawl of Amazon's public Best Sellers pages; medians use the latest list. The opportunity score (0–100, higher is easier to enter) combines the review barrier, the share of low-review books, list turnover, new-release share and price.