Bloomz allows admins of the schools to bulk import the members in the following ways.
Bulk CSV Import:
Bulk Import of Students and Parents to the school using a CSV file upload
Bulk Import of Teachers to the school using a CSV file upload?
Bulk Data Import Using CSV Files In A Browser / Manual/CSV Transitioning to the new school year - School Admins
SFTP Import:
SFTP Bulk File Export Instructions
Clever Import:
Clever School Integration - A Guide for School Admin
Clever Autosync for Administrators