KDP categories · Top KDP authors
Colin Harrison: Amazon KDP author data
As of Nov 6, 2026, Colin Harrison has 4 books on Amazon, 3 of them on a best-seller list in the last 30 days (best rank #24), mostly in Trees, Test Preparation, Testing.
| Median price | $14.99 |
|---|---|
| Price range (middle 50%) | $10.99 – $21.50 |
| Median reviews | 1 |
| Total reviews | 2 |
| New listings (30 days, incl. new editions) | 3 |
| Breakout books (30 days) | 2 |
What stands out
- Median price $14.99, 20% below the median of their main category, Trees.
- 3 new listings in the last 30 days (new editions included), 2 of them broke into a Best Sellers list.
Colin Harrison's best-ranked books
-
Digital SAT and PSAT Math Practice Tests and Solutions for the Adaptive Second Module (5 Full Tests)
by Colin Harrison
- Price$6.99
- Rating5.0
- Reviews1
-
The Orchard Path: On Nature, Time, and Growing Pears
by Colin Harrison
- Price$14.99
- Reviews-
-
Digital SAT & PSAT 3 Full Practice Tests with Detailed Solutions
by Colin Harrison
- Price$0
- Rating5.0
- Reviews1
-
The Orchard Path: On Nature, Time, and Growing Pears
by Colin Harrison
- Price$28
- Reviews-
Main categories
FAQ
How many books does Colin Harrison have on Amazon?
KDPTop tracks 4 of their books; 3 made an Amazon list in the last 30 days.
Which categories does Colin Harrison publish in?
Their books chart most often in Trees, Test Preparation, Testing.
How does Colin Harrison price their books?
The median price is $14.99; half of the books cost $10.99–$21.50.
Has Colin Harrison 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.