KDP categories · Top KDP authors
Billie K Marrero: Amazon KDP author data
As of Nov 6, 2026, Billie K Marrero has 33 books on Amazon, 7 of them on a best-seller list in the last 30 days (best rank #6), mostly in General, Test Preparation & Review, Certification.
| Median price | $29.99 |
|---|---|
| Price range (middle 50%) | $29.49 – $32.27 |
| Median reviews | 2 |
| Total reviews | 36 |
| New listings (30 days, incl. new editions) | 3 |
| Breakout books (30 days) | 2 |
What stands out
- Median price $29.99, 43% below the median of their main category, General.
- 3 new listings in the last 30 days (new editions included), 2 of them broke into a Best Sellers list.
Billie K Marrero's best-ranked books
-
EPIC AMBULATORY & CLINICAL SYSTEMS STUDY GUIDE 2027-2028: Everything You Need to Pass: Master Clinical Documentation, Orders, Results, Messaging, ... Practice Exams and Proven Test Strategies
by Billie K Marrero
- Price$29.99
- Rating5.0
- Reviews2
-
Suffolk County Police Officer Exam Prep 2027-2028: Everything You Need to Pass: Complete Exam 8-5002 Review with Cognitive Ability Practice, Work ... Practice Tests, and Proven Test Strategies
by Billie K Marrero
- Price$29.99
- Rating5.0
- Reviews1
-
CHFM Exam Study Guide 2026-2027: Everything You Need to Pass: 4 Full-Length Practice Exams, Comprehensive Content Review, and Proven Test Strategies for Test-Day Confidence
by Billie K Marrero
- Price$21.99
- Rating5.0
- Reviews1
- Published2026-01
-
Louisiana Contractor’s Residential License Study Guide 2026-2027: Everything You Need to Pass: 3 Full-Length Practice Exams, Complete Trade Review, ... Test-Day Strategies for Confident Results
by Billie K Marrero
- Price$34.99
- Rating5.0
- Reviews3
-
ATLS STUDY GUIDE 2026-2027: 3 Full-Length Advanced Trauma Life Support Practice Exams with Explanations, Core Concepts and Algorithms, Practical Skills Toolkit
by Billie K Marrero
- Price$30
- Rating5.0
- Reviews3
- Published2025-11
-
NATA BOC INTENSIVE STUDY GUIDE 2026-2027: Everything You Need to Pass: 3 Full-Length Practice Exams, High-Yield Domain Review, and Test-Day Methods to Help You Perform with Confidence
by Billie K Marrero
- Price$34.55
- Rating5.0
- Reviews2
-
NICET Fire Alarm Systems Level 1 Study Guide 2026-2027: Everything You Need to Get Certified: 4 Full-Length Practice Exams, Real-World Scenario Drills, and Field-Ready Workflow Tips
by Billie K Marrero
- Price$28.99
- Rating4.2
- Reviews5
-
NACE I PN-RN Study Guide 2025–2026: Master the Nursing Acceleration Challenge Exam with 500+ Practice Questions, Detailed Explanations, and Proven Strategies to Ensure Success
by Billie K Marrero
- Price-
- Rating3.6
- Reviews3
- Published2025-08
-
CDA Preschool Exam Study Guide 2025-2026: Ace the Child Development Associate (CDA) Credential with 5 Full-Length Practice Exams, Targeted Content Review, and Proven Strategies for Guaranteed Success
by Billie K Marrero
- Price-
- Rating5.0
- Reviews3
- Published2025-08
-
Praxis Social Studies 5581 Study Guide 2025-2026: Everything You Need to Pass: 3 Full-Length Practice Exams, Comprehensive Content Review, and Proven Strategies for Guaranteed Success
by Billie K Marrero
- Price-
- Rating3.0
- Reviews2
- Published2025-08
Main categories
FAQ
How many books does Billie K Marrero have on Amazon?
KDPTop tracks 33 of their books; 7 made an Amazon list in the last 30 days.
Which categories does Billie K Marrero publish in?
Their books chart most often in General, Test Preparation & Review, Certification.
How does Billie K Marrero price their books?
The median price is $29.99; half of the books cost $29.49–$32.27.
Has Billie K Marrero released new books recently?
3 new books in the last 30 days, 2 of which reached a Best Sellers list.
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.