Follow the below path to schedule the exam timetable
Method 1: With the System admin access
Settings --> Admissions --> Pre admission Exam Timetable --> Select the Branch, Academic year and click on Get --> Click on + Symbol against the class --> Schedule exam date and time --> Save
Method 2: With the Branch level access
Admissions --> Preadmission Exam --> Map Students to Exam dates --> Select Academic year, Class and click on Get --> Click on + Symbol against the class --> Update the exam Date and Time --> Save