You can reschedule your exam no lately than 2 business days from your scheduled time.
Exam vendor note: Regardless of how or where you take your LPI exams, you must register online to receive an LPI identification number first. Failure to complete this step may affect your eligibility for your desired time slot. Also you must provide your LPI ID to the test centres when registering for an exam. Registration is free of charge and is completed here at the LPI web site. Register Now!