Help Center

Welcome — your first 10 minutes

A quick tour: where things are, how the simulator works, and what to do first.

How to study effectively

Concept → Practice → Mastery → Review. The flow that actually works.

Using the simulated terminal

Keyboard shortcuts, tab completion, and what is (and is not) simulated.

How spaced repetition works

Why due items appear when they do, and how to keep the queue manageable.

Approaching the timed exam

Time management, pacing, and what to do when you get stuck.

Reading your score report

Domain breakdowns, weak areas, and how to translate scores into a study plan.

Manage your subscription

How to update payment methods, switch monthly/yearly, or cancel.

Export or delete your account

GDPR rights — export everything as JSON or remove your account permanently.

Billing problems and refunds

Failed payments, refund requests, and our 7-day money-back guarantee.

Sessions, capacity, and billing

Queue behavior, lost work, exhausted hours, cancellation, refunds, and connection help.

Progress not syncing across devices

When sync should work, what can go wrong, and how to recover.

Didn't get a verification email?

Resend instructions, spam-folder tips, and what to do if your email never arrives.

Browser compatibility

What browsers we test on and what to do if something looks broken.