In that case,  you will need to retake any applicable knowledge tests you passed more than 180 days from the date you apply for reinstatement.
How do I get a non-commercial driver's license?
You can get a non-commercial duplicate license online  after the effective date on the downgrade notice.Since then your commercial class license document will no longer be valid.
I've received a notice of non-compliance and license downgrade, what should I do now?