Editorial standards

Expert reviewers & editorial team

Licensing exams are high-stakes, so it matters who stands behind the material. Our questions and guides are written by our founder and reviewed by real, state-licensed professionals. Every license below is public — click through and verify it yourself on the issuing board.

Written & maintained by

Sen Lin

Founder, PrepPass

Software engineer and founder of PrepPass. Built the bilingual license-exam question banks and has first-hand experience helping students pass the California CSLB Business & Law, real estate salesperson, and insurance licensing exams. (Founder and author — not a claimed licensed professional; professional accuracy is handled by the reviewers below.)

LinkedIn ↗

Reviewed by state-licensed professionals

John Zhang

Verified license

Licensed California Real Estate Salesperson

Reviews: California real estate salesperson exam prep

CA DRE #02222880Verify on California Department of Real Estate (DRE) ↗

John Zihao Zhang

Verified license

California-Licensed Life Insurance Agent

Reviews: Life & Health insurance license exam prep (national + all state variants)

CA Dept. of Insurance License #4396095Verify on California Department of Insurance (CDI) ↗

How we verify every fact

Every number and rule is cross-checked against the official board or statute — read our full review process.

Our editorial process →