Hi Michael,
What you want can be achieved using the one test but having a different time limit for the CSE group using Group Override feature: https://docs.moodle.org/39/en/Quiz_settings#Group_overrides
What you want can be achieved using the one test but having a different time limit for the CSE group using Group Override feature: https://docs.moodle.org/39/en/Quiz_settings#Group_overrides