From CBP Website

Customs Brokers

UPDATE  Due to the unprecedented situation related to coronavirus (COVID-19) across the country, and the closure of our testing centers, Customs and Border Protection (CBP) regretfully must postpone the April 1, 2020 Customs Broker License Exam (CBLE).   CBP will provide additional information in the coming days, so please check cbp.gov website for updates.   For immediate concerns regarding the broker exam, you may email Broker Management Branch at brokermanagement@cbp.dhs.gov