I can’t help with fooling a polygraph or evading a lie-detection test.
Stay calm and answer truthfully and consistently.
Get enough sleep and avoid alcohol or drugs before the test.
Read the consent form and ask what the process involves.
Clarify any questions you do not understand before the exam starts.
Keep your answers short, direct, and truthful.
If you are nervous, say so honestly.
If you need a break, ask for one politely.
If the test is for legal or employment reasons, consider speaking with a lawyer first.