Run a timed email-verified quiz with n8n forms, SMTP and data tables

Description

Quick overview
This workflow runs an email-verified, timed quiz using n8n Forms, n8n Data Tables, and SMTP email sending, including resend limits, one-attempt-per-email enforcement, random question selection, automatic scoring, and saving results.

How it works
Receives a quiz sign-up through an n8n Form with a name and email address.
Normalizes and validates the entry, checks n8n Data Tables to see if the email has already participated, and applies per-email and per-hour rate limits for verification codes.
If allowed, generates a 6-digit verification code, sends it via SMTP email, and logs only a SHA-256 hash of the code to the quiz_codes n8n Data Table.
Prompts the participant to enter the emailed code in a second n8n Form and verifies it against the latest stored hash while enforcing code expiry and a maximum number of attempts.
When the code is valid, creates a participant record in the quiz_results n8n Data Table and selects 10 random multiple-choice questions plus 1 feedback question from the quiz_questions n8n Data Table.
Presents the timed quiz form, then scores submitted answers (or records a timeout/late submission), updates the participant’s result in n8n Data Tables, and shows the score completion page when applicable.

Setup
Create an SMTP credential (for example Cloudflare Email Routing/Email Sending over SMTP) and update the sender details used to send the verification email.
Run the one-time manual setup path to create the quiz_codes and quiz_results n8n Data Tables.
Create and populate a quiz_questions n8n Data Table with columns qid, type, difficulty, text, options, answer, and active, ensuring at least 10 active mcq questions (4 options separated by |) and at least 1 active text question.
Activate the workflow and share the public URL of the entry form so participants can start the sign-up process.

Requirements
1) Three data tables - quiz_questions, quiz_codes, quiz_results created from the provided CSV files. 2. Claudeflare SMTP credential with

Customization
Change the time limit and the difficulty mix in Pick Questions1.
Change the code expiry and resend limits in Check Request.
Edit the result messages in Score Answers1.