KDP categories · Top KDP authors
Biren: Amazon KDP author data
As of Nov 6, 2026, Biren has 53 books on Amazon, 11 of them on a best-seller list in the last 30 days (best rank #11), mostly in Handwriting Analysis, Handwriting, Language Arts.
| Median price | $15.74 |
|---|---|
| Price range (middle 50%) | $12.99 – $17.99 |
| Median reviews | 1 |
| Total reviews | 57 |
| New books (30 days) | 2 |
| Breakout books (30 days) | 1 |
What stands out
- Median price $15.74, 58% above the median of their main category, Handwriting Analysis.
Biren's best-ranked books
-
FIX YOUR HANDWRITING IN 30 DAYS: TEEN EDITION
by Biren
- Price$12.99
- Rating4.3
- Reviews15
-
Fix Your Handwriting in 30 Days: Adult Edition - A Daily Print Penmanship Workbook to Improve Legibility, Spacing & Style
by Biren
- Price$12.99
- Rating3.0
- Reviews3
-
English Power Workbook, Grades 9–10: Reading, Vocabulary, Grammar & Writing — Common Core Practice with Worked Examples, Biren's Hacks & Full Answer Keys
by Biren
- Price$14.99
- Rating5.0
- Reviews1
-
Geometry in 30 Days: A High School Geometry Workbook with Daily Spiral Review, 495 Practice Problems and Fully Worked Solutions
by Biren
- Price$17.99
- Rating5.0
- Reviews1
- Published2026-08
-
Study Skills Power Workbook for High Schoolers: Get Organized, Take Better Notes & Ace Your Exams — Worked Examples, Templates, Hacks & Answer Keys
by Biren
- Price$14.66
- Reviews-
-
7th Grade Science: A Complete Guide for Curious Minds
by Biren
- Price$25.99
- Reviews-
-
AP Calculus AB Power Workbook: 8-Unit Review with Biren's Hacks, Hundreds of Practice Problems & a Full-Length Practice Exam — with Detailed Answer Keys (Biren's AP Power Workbooks)
by Biren
- Price$18.99
- Rating4.0
- Reviews1
-
AP English Literature & Composition Power Workbook: A Skill-by-Skill Close-Reading & Essay Course with Biren's Hacks, Practice Passages & a ... Answer Keys (Biren's AP Power Workbooks)
by Biren
- Price$15.99
- Reviews-
-
5th Grade Science Workbook: NGSS-Aligned Lessons, Activities, Diagrams, Memory Tricks, Practice Tests & Answer Key
by Biren
- Price$16.08
- Rating5.0
- Reviews1
-
10th Grade Math Power Workbook: Algebra, Quadratics, Functions, Graphing & SAT Readiness with 1,180+ Practice Problems
by Biren
- Price$18.36
- Rating5.0
- Reviews1
Main categories
FAQ
How many books does Biren have on Amazon?
KDPTop tracks 53 of their books; 11 made an Amazon list in the last 30 days.
Which categories does Biren publish in?
Their books chart most often in Handwriting Analysis, Handwriting, Language Arts.
How does Biren price their books?
The median price is $15.74; half of the books cost $12.99–$17.99.
Has Biren released new books recently?
2 new books in the last 30 days, 1 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.