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An admission ticket is a document issued by the Board office which states that an applicant is registered and eligible to sit for an examination. It contains information on where the applicant will sit during the exam, and details on the exam location.
http://www.pabarexam.org/bar_exam_information/tixinfo.htm

Before viewing your ticket, you will be prompted to read and agree to abide by the conditions, requirements, policies, and procedures for the CFA exam. It is your responsibility to print one copy of your admission ticket on clean, unused paper and bring it with you to the test center on exam day. You will not be admitted into the testing room without an admission ticket.
http://www.cfainstitute.org/about/governance/policies/Pages/...

The Admission Ticket confirms that a student is registered to take a specified test on a specified date, at a specified test center.
http://professionals.collegeboard.com/testing/sat-reasoning/...

The admission ticket for the 2013 Exam administrations will be available as listed below. You will receive an email with instructions on how to download your ticket.
http://www.garp.org/frm/exam-overview/exam-day-information.a...

admission tickets will be distributed tomorrow.

The phrase means distribution of meeting entry card.